20937511205 has 32 divisors (see below), whose sum is σ = 28673537760. Its totient is φ = 14564229120.

The previous prime is 20937511181. The next prime is 20937511241. The reversal of 20937511205 is 50211573902.

It is a Cunningham number, because it is equal to 144698²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 8813078884 + 12124432321 = 93878^2 + 110111^2 .

It is not a de Polignac number, because 20937511205 - 2¹² = 20937507109 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 58172 + ... + 212741.

It is an arithmetic number, because the mean of its divisors is an integer number (896048055).

Almost surely, 2^20937511205 is an apocalyptic number.

It is an amenable number.

20937511205 is a deficient number, since it is larger than the sum of its proper divisors (7736026555).

20937511205 is a wasteful number, since it uses less digits than its factorization.

20937511205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271001.

The product of its (nonzero) digits is 18900, while the sum is 35.

The spelling of 20937511205 in words is "twenty billion, nine hundred thirty-seven million, five hundred eleven thousand, two hundred five".