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10320231220 = 2251339693197
BaseRepresentation
bin10011001110010001…
…00011101100110100
3222122020100001202221
421213020203230310
5132113434344340
64424022212124
7513513342445
oct114710435464
928566301687
1010320231220
114416557512
122000284044
13c8614c9c0
146dc8c12cc
1540606644a
hex267223b34

10320231220 has 24 divisors (see below), whose sum is σ = 23339600424. Its totient is φ = 3810546816.

The previous prime is 10320231193. The next prime is 10320231223. The reversal of 10320231220 is 2213202301.

It can be written as a sum of positive squares in 4 ways, for example, as 63808144 + 10256423076 = 7988^2 + 101274^2 .

It is a junction number, because it is equal to n+sod(n) for n = 10320231194 and 10320231203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10320231223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19846339 + ... + 19846858.

It is an arithmetic number, because the mean of its divisors is an integer number (972483351).

Almost surely, 210320231220 is an apocalyptic number.

10320231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10320231220 is an abundant number, since it is smaller than the sum of its proper divisors (13019369204).

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

10320231220 is a wasteful number, since it uses less digits than its factorization.

10320231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39693219 (or 39693217 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 10320231220 its reverse (2213202301), we get a palindrome (12533433521).

The spelling of 10320231220 in words is "ten billion, three hundred twenty million, two hundred thirty-one thousand, two hundred twenty".

Divisors: 1 2 4 5 10 13 20 26 52 65 130 260 39693197 79386394 158772788 198465985 396931970 516011561 793863940 1032023122 2064046244 2580057805 5160115610 10320231220