20153231564 has 48 divisors (see below), whose sum is σ = 37239229440. Its totient is φ = 9530272320.

The previous prime is 20153231537. The next prime is 20153231569. The reversal of 20153231564 is 46513235102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20153231564.

It is not an unprimeable number, because it can be changed into a prime (20153231569) by changing a digit.

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, 1257707 + ... + 1273629.

It is an arithmetic number, because the mean of its divisors is an integer number (775817280).

Almost surely, 2^20153231564 is an apocalyptic number.

It is an amenable number.

20153231564 is a deficient number, since it is larger than the sum of its proper divisors (17085997876).

20153231564 is a wasteful number, since it uses less digits than its factorization.

20153231564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16190 (or 16188 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 20153231564 its reverse (46513235102), we get a palindrome (66666466666).

The spelling of 20153231564 in words is "twenty billion, one hundred fifty-three million, two hundred thirty-one thousand, five hundred sixty-four".