20369874456405 has 18 divisors (see below), whose sum is σ = 35307834869814. Its totient is φ = 10863916896144.

The previous prime is 20369874456341. The next prime is 20369874456443. The reversal of 20369874456405 is 50465447896302.

20369874456405 is a `hidden beast` number, since 2 + 0 + 3 + 69 + 8 + 7 + 4 + 4 + 564 + 0 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16295899565124 + 4073974891281 = 4036818^2 + 2018409^2 .

It is not a de Polignac number, because 20369874456405 - 2⁶ = 20369874456341 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 29939734 + ... + 30612536.

Almost surely, 2^{20369874456405} is an apocalyptic number.

It is an amenable number.

20369874456405 is a deficient number, since it is larger than the sum of its proper divisors (14937960413409).

20369874456405 is an frugal number, since it uses more digits than its factorization.

20369874456405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345617 (or 672811 counting only the distinct ones).

The product of its (nonzero) digits is 174182400, while the sum is 63.

The spelling of 20369874456405 in words is "twenty trillion, three hundred sixty-nine billion, eight hundred seventy-four million, four hundred fifty-six thousand, four hundred five".