20447566520 has 64 divisors (see below), whose sum is σ = 48200140800. Its totient is φ = 7797018240.

The previous prime is 20447566519. The next prime is 20447566543. The reversal of 20447566520 is 2566574402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39980 + ... + 206139.

It is an arithmetic number, because the mean of its divisors is an integer number (753127200).

Almost surely, 2^20447566520 is an apocalyptic number.

20447566520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20447566520 is an abundant number, since it is smaller than the sum of its proper divisors (27752574280).

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

20447566520 is a wasteful number, since it uses less digits than its factorization.

20447566520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246228 (or 246224 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 20447566520 in words is "twenty billion, four hundred forty-seven million, five hundred sixty-six thousand, five hundred twenty".