20423521435264 has 32 divisors (see below), whose sum is σ = 40832279498340. Its totient is φ = 10175419914240.

The previous prime is 20423521435259. The next prime is 20423521435309. The reversal of 20423521435264 is 46253412532402.

It can be written as a sum of positive squares in 2 ways, for example, as 16399324953664 + 4024196481600 = 4049608^2 + 2006040^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 20423521435264.

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, 283876419 + ... + 283948354.

Almost surely, 2^{20423521435264} is an apocalyptic number.

It is an amenable number.

20423521435264 is a deficient number, since it is larger than the sum of its proper divisors (20408758063076).

20423521435264 is an equidigital number, since it uses as much as digits as its factorization.

20423521435264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567825068 (or 567825056 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 43.

Adding to 20423521435264 its reverse (46253412532402), we get a palindrome (66676933967666).

The spelling of 20423521435264 in words is "twenty trillion, four hundred twenty-three billion, five hundred twenty-one million, four hundred thirty-five thousand, two hundred sixty-four".