20505915934 has 16 divisors (see below), whose sum is σ = 35634548448. Its totient is φ = 8667862272.

The previous prime is 20505915919. The next prime is 20505915943. The reversal of 20505915934 is 43951950502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10031227 + ... + 10033270.

It is an arithmetic number, because the mean of its divisors is an integer number (2227159278).

Almost surely, 2^20505915934 is an apocalyptic number.

20505915934 is a deficient number, since it is larger than the sum of its proper divisors (15128632514).

20505915934 is a wasteful number, since it uses less digits than its factorization.

20505915934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20064579.

The product of its (nonzero) digits is 243000, while the sum is 43.

The spelling of 20505915934 in words is "twenty billion, five hundred five million, nine hundred fifteen thousand, nine hundred thirty-four".