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20011220100 = 2235521376011
BaseRepresentation
bin10010101000110000…
…101111110010000100
31220122121122022100000
4102220300233302010
5311440333020400
613105405521300
71305616364364
oct225060576204
956577568300
1020011220100
1185398a2933
123a65873230
131b6bb05951
14d7b9a69a4
157c1c35600
hex4a8c2fc84

20011220100 has 216 divisors, whose sum is σ = 65532868128. Its totient is φ = 5296492800.

The previous prime is 20011220093. The next prime is 20011220113. The reversal of 20011220100 is 102211002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3326095 + ... + 3332105.

It is an arithmetic number, because the mean of its divisors is an integer number (303392908).

Almost surely, 220011220100 is an apocalyptic number.

20011220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20011220100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32766434064).

20011220100 is an abundant number, since it is smaller than the sum of its proper divisors (45521648028).

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

20011220100 is a wasteful number, since it uses less digits than its factorization.

20011220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6177 (or 6158 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20011220100 its reverse (102211002), we get a palindrome (20113431102).

The spelling of 20011220100 in words is "twenty billion, eleven million, two hundred twenty thousand, one hundred".