20531613502 has 16 divisors (see below), whose sum is σ = 31689198432. Its totient is φ = 9972383200.

The previous prime is 20531613499. The next prime is 20531613521.

20531613502 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 948178 + ... + 969589.

It is an arithmetic number, because the mean of its divisors is an integer number (1980574902).

Almost surely, 2^20531613502 is an apocalyptic number.

20531613502 is a deficient number, since it is larger than the sum of its proper divisors (11157584930).

20531613502 is a wasteful number, since it uses less digits than its factorization.

20531613502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917923.

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 20531613502 in words is "twenty billion, five hundred thirty-one million, six hundred thirteen thousand, five hundred two".