20070657405 has 12 divisors (see below), whose sum is σ = 34789139580. Its totient is φ = 10704350592.

The previous prime is 20070657401. The next prime is 20070657461. The reversal of 20070657405 is 50475607002.

It can be written as a sum of positive squares in 2 ways, for example, as 15353440281 + 4717217124 = 123909^2 + 68682^2 .

It is not a de Polignac number, because 20070657405 - 2² = 20070657401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20070657405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20070657401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 223007260 + ... + 223007349.

It is an arithmetic number, because the mean of its divisors is an integer number (2899094965).

Almost surely, 2^20070657405 is an apocalyptic number.

It is an amenable number.

20070657405 is a deficient number, since it is larger than the sum of its proper divisors (14718482175).

20070657405 is a wasteful number, since it uses less digits than its factorization.

20070657405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446014620 (or 446014617 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The spelling of 20070657405 in words is "twenty billion, seventy million, six hundred fifty-seven thousand, four hundred five".