20101010920 has 16 divisors (see below), whose sum is σ = 45227274660. Its totient is φ = 8040404352.

The previous prime is 20101010873. The next prime is 20101010927. The reversal of 20101010920 is 2901010102.

It can be written as a sum of positive squares in 2 ways, for example, as 18340201476 + 1760809444 = 135426^2 + 41962^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20101010894 and 20101010903.

It is not an unprimeable number, because it can be changed into a prime (20101010927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251262597 + ... + 251262676.

Almost surely, 2^20101010920 is an apocalyptic number.

20101010920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101010920 is an abundant number, since it is smaller than the sum of its proper divisors (25126263740).

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

20101010920 is a wasteful number, since it uses less digits than its factorization.

20101010920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502525284 (or 502525280 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 20101010920 in words is "twenty billion, one hundred one million, ten thousand, nine hundred twenty".