20499469637955 has 64 divisors (see below), whose sum is σ = 40893062685696. Its totient is φ = 8519132160000.

The previous prime is 20499469637893. The next prime is 20499469637963. The reversal of 20499469637955 is 55973696499402.

It is a Cunningham number, because it is equal to 4527634²-1.

It is not a de Polignac number, because 20499469637955 - 2⁹ = 20499469637443 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 149343355 + ... + 149480555.

It is an arithmetic number, because the mean of its divisors is an integer number (638954104464).

Almost surely, 2^{20499469637955} is an apocalyptic number.

20499469637955 is a deficient number, since it is larger than the sum of its proper divisors (20393593047741).

20499469637955 is a wasteful number, since it uses less digits than its factorization.

20499469637955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266588.

The product of its (nonzero) digits is 3968092800, while the sum is 78.

The spelling of 20499469637955 in words is "twenty trillion, four hundred ninety-nine billion, four hundred sixty-nine million, six hundred thirty-seven thousand, nine hundred fifty-five".