20907912228 has 48 divisors (see below), whose sum is σ = 55831286784. Its totient is φ = 5965454880.

The previous prime is 20907912191. The next prime is 20907912229. The reversal of 20907912228 is 82221970902.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 20907912228.

It is not an unprimeable number, because it can be changed into a prime (20907912229) 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 15 ways as a sum of consecutive naturals, for example, 110118 + ... + 232253.

It is an arithmetic number, because the mean of its divisors is an integer number (1163151808).

Almost surely, 2^20907912228 is an apocalyptic number.

20907912228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20907912228 is an abundant number, since it is smaller than the sum of its proper divisors (34923374556).

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

20907912228 is a wasteful number, since it uses less digits than its factorization.

20907912228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343112 (or 343110 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 20907912228 in words is "twenty billion, nine hundred seven million, nine hundred twelve thousand, two hundred twenty-eight".