20526456640 has 56 divisors (see below), whose sum is σ = 49918632192. Its totient is φ = 8035883520.

The previous prime is 20526456583. The next prime is 20526456641. The reversal of 20526456640 is 4665462502.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 20526456593 and 20526456602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20526456641) 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, 667356 + ... + 697435.

Almost surely, 2^20526456640 is an apocalyptic number.

20526456640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20526456640 is an abundant number, since it is smaller than the sum of its proper divisors (29392175552).

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

20526456640 is a wasteful number, since it uses less digits than its factorization.

20526456640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364855 (or 1364845 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

The spelling of 20526456640 in words is "twenty billion, five hundred twenty-six million, four hundred fifty-six thousand, six hundred forty".