20261578560 has 56 divisors (see below), whose sum is σ = 64330514976. Its totient is φ = 5403087360.

The previous prime is 20261578559. The next prime is 20261578591. The reversal of 20261578560 is 6587516202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10551946 + ... + 10553865.

It is an arithmetic number, because the mean of its divisors is an integer number (1148759196).

Almost surely, 2^20261578560 is an apocalyptic number.

20261578560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20261578560 is an abundant number, since it is smaller than the sum of its proper divisors (44068936416).

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

20261578560 is a wasteful number, since it uses less digits than its factorization.

20261578560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21105831 (or 21105821 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 42.

The spelling of 20261578560 in words is "twenty billion, two hundred sixty-one million, five hundred seventy-eight thousand, five hundred sixty".