20090910920 has 32 divisors (see below), whose sum is σ = 45334107000. Its totient is φ = 8013331968.

The previous prime is 20090910919. The next prime is 20090910929. The reversal of 20090910920 is 2901909002.

It can be written as a sum of positive squares in 4 ways, for example, as 11919835684 + 8171075236 = 109178^2 + 90394^2 .

It is not an unprimeable number, because it can be changed into a prime (20090910929) 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, 705629 + ... + 733548.

Almost surely, 2^20090910920 is an apocalyptic number.

20090910920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20090910920 is an abundant number, since it is smaller than the sum of its proper divisors (25243196080).

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

20090910920 is a wasteful number, since it uses less digits than its factorization.

20090910920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439537 (or 1439533 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 20090910920 in words is "twenty billion, ninety million, nine hundred ten thousand, nine hundred twenty".