20564215452 has 72 divisors (see below), whose sum is σ = 59172946560. Its totient is φ = 5960639520.

The previous prime is 20564215439. The next prime is 20564215457. The reversal of 20564215452 is 25451246502.

20564215452 is a `hidden beast` number, since 2 + 0 + 5 + 642 + 1 + 5 + 4 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564215457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1119802 + ... + 1138017.

It is an arithmetic number, because the mean of its divisors is an integer number (821846480).

Almost surely, 2^20564215452 is an apocalyptic number.

20564215452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20564215452 is an abundant number, since it is smaller than the sum of its proper divisors (38608731108).

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

20564215452 is a wasteful number, since it uses less digits than its factorization.

20564215452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2257863 (or 2257858 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

The spelling of 20564215452 in words is "twenty billion, five hundred sixty-four million, two hundred fifteen thousand, four hundred fifty-two".