20623600564 has 48 divisors (see below), whose sum is σ = 42262843392. Its totient is φ = 8622281952.

The previous prime is 20623600513. The next prime is 20623600573. The reversal of 20623600564 is 46500632602.

It is a super-2 number, since 2×20623600564² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 378489 + ... + 429535.

It is an arithmetic number, because the mean of its divisors is an integer number (880475904).

Almost surely, 2^20623600564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20623600564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21131421696).

20623600564 is an abundant number, since it is smaller than the sum of its proper divisors (21639242828).

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

20623600564 is a wasteful number, since it uses less digits than its factorization.

20623600564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51412 (or 51410 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The spelling of 20623600564 in words is "twenty billion, six hundred twenty-three million, six hundred thousand, five hundred sixty-four".