20477361231 has 6 divisors (see below), whose sum is σ = 29578410680. Its totient is φ = 13651574148.

The previous prime is 20477361217. The next prime is 20477361263. The reversal of 20477361231 is 13216377402.

20477361231 is a `hidden beast` number, since 2 + 0 + 4 + 7 + 7 + 3 + 612 + 31 = 666.

It is not a de Polignac number, because 20477361231 - 2⁶ = 20477361167 is a prime.

It is a super-2 number, since 2×20477361231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20477361211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1137631171 + ... + 1137631188.

Almost surely, 2^20477361231 is an apocalyptic number.

20477361231 is a deficient number, since it is larger than the sum of its proper divisors (9101049449).

20477361231 is a wasteful number, since it uses less digits than its factorization.

20477361231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2275262365 (or 2275262362 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The spelling of 20477361231 in words is "twenty billion, four hundred seventy-seven million, three hundred sixty-one thousand, two hundred thirty-one".