20507274477 has 12 divisors (see below), whose sum is σ = 29626943164. Its totient is φ = 13669058880.

The previous prime is 20507274461. The next prime is 20507274553. The reversal of 20507274477 is 77447270502.

20507274477 is a `hidden beast` number, since 2 + 0 + 507 + 2 + 74 + 4 + 77 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17347260681 + 3160013796 = 131709^2 + 56214^2 .

It is not a de Polignac number, because 20507274477 - 2⁴ = 20507274461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20507274377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151198 + ... + 252735.

Almost surely, 2^20507274477 is an apocalyptic number.

It is an amenable number.

20507274477 is a deficient number, since it is larger than the sum of its proper divisors (9119668687).

20507274477 is a wasteful number, since it uses less digits than its factorization.

20507274477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409580 (or 409577 counting only the distinct ones).

The product of its (nonzero) digits is 768320, while the sum is 45.

The spelling of 20507274477 in words is "twenty billion, five hundred seven million, two hundred seventy-four thousand, four hundred seventy-seven".