20513231502 has 16 divisors (see below), whose sum is σ = 41432666832. Its totient is φ = 6770043200.

The previous prime is 20513231477. The next prime is 20513231503.

It is a happy number.

20513231502 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513231503) 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 7 ways as a sum of consecutive naturals, for example, 16924503 + ... + 16925714.

It is an arithmetic number, because the mean of its divisors is an integer number (2589541677).

Almost surely, 2^20513231502 is an apocalyptic number.

20513231502 is an abundant number, since it is smaller than the sum of its proper divisors (20919435330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20513231502 is a wasteful number, since it uses less digits than its factorization.

20513231502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33850323.

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 20513231502 in words is "twenty billion, five hundred thirteen million, two hundred thirty-one thousand, five hundred two".