20400515225564 has 12 divisors (see below), whose sum is σ = 35778343950888. Its totient is φ = 10178131239600.

The previous prime is 20400515225557. The next prime is 20400515225603. The reversal of 20400515225564 is 46552251500402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5531591222 + ... + 5531594909.

It is an arithmetic number, because the mean of its divisors is an integer number (2981528662574).

Almost surely, 2^{20400515225564} is an apocalyptic number.

It is an amenable number.

20400515225564 is a deficient number, since it is larger than the sum of its proper divisors (15377828725324).

20400515225564 is a wasteful number, since it uses less digits than its factorization.

20400515225564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11063186596 (or 11063186594 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 41.

Adding to 20400515225564 its reverse (46552251500402), we get a palindrome (66952766725966).

The spelling of 20400515225564 in words is "twenty trillion, four hundred billion, five hundred fifteen million, two hundred twenty-five thousand, five hundred sixty-four".