20505183690 has 16 divisors (see below), whose sum is σ = 49212440928. Its totient is φ = 5468048976.

The previous prime is 20505183689. The next prime is 20505183701. The reversal of 20505183690 is 9638150502.

It is a super-2 number, since 2×20505183690² (a number of 21 digits) contains 22 as substring.

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, 341753032 + ... + 341753091.

It is an arithmetic number, because the mean of its divisors is an integer number (3075777558).

Almost surely, 2^20505183690 is an apocalyptic number.

20505183690 is an abundant number, since it is smaller than the sum of its proper divisors (28707257238).

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

20505183690 is a wasteful number, since it uses less digits than its factorization.

20505183690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683506133.

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 20505183690 in words is "twenty billion, five hundred five million, one hundred eighty-three thousand, six hundred ninety".