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20102111220 = 2235973453971
BaseRepresentation
bin10010101110001011…
…011101111111110100
31220212221200001111210
4102232023131333310
5312132120024340
613122414001420
71311102061152
oct225613357764
956787601453
1020102111220
118586132764
123a901a6270
131b848aa389
14d89aa63d2
157c9bdb180
hex4ae2ddff4

20102111220 has 48 divisors (see below), whose sum is σ = 56866195008. Its totient is φ = 5305297920.

The previous prime is 20102111189. The next prime is 20102111257. The reversal of 20102111220 is 2211120102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20102111196 and 20102111205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1721166 + ... + 1732805.

It is an arithmetic number, because the mean of its divisors is an integer number (1184712396).

Almost surely, 220102111220 is an apocalyptic number.

20102111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20102111220 is an abundant number, since it is smaller than the sum of its proper divisors (36764083788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20102111220 is a wasteful number, since it uses less digits than its factorization.

20102111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3454080 (or 3454078 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20102111220 its reverse (2211120102), we get a palindrome (22313231322).

The spelling of 20102111220 in words is "twenty billion, one hundred two million, one hundred eleven thousand, two hundred twenty".

Divisors: 1 2 3 4 5 6 10 12 15 20 30 60 97 194 291 388 485 582 970 1164 1455 1940 2910 5820 3453971 6907942 10361913 13815884 17269855 20723826 34539710 41447652 51809565 69079420 103619130 207238260 335035187 670070374 1005105561 1340140748 1675175935 2010211122 3350351870 4020422244 5025527805 6700703740 10051055610 20102111220