20477621331 has 6 divisors (see below), whose sum is σ = 29578786380. Its totient is φ = 13651747548.

The previous prime is 20477621323. The next prime is 20477621341. The reversal of 20477621331 is 13312677402.

20477621331 is a `hidden beast` number, since 20 + 4 + 7 + 7 + 621 + 3 + 3 + 1 = 666.

It is not a de Polignac number, because 20477621331 - 2³ = 20477621323 is a prime.

It is a super-2 number, since 2×20477621331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20477621341) 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 5 ways as a sum of consecutive naturals, for example, 1137645621 + ... + 1137645638.

It is an arithmetic number, because the mean of its divisors is an integer number (4929797730).

Almost surely, 2^20477621331 is an apocalyptic number.

20477621331 is a deficient number, since it is larger than the sum of its proper divisors (9101165049).

20477621331 is a wasteful number, since it uses less digits than its factorization.

20477621331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275291265 (or 2275291262 counting only the distinct ones).

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

The spelling of 20477621331 in words is "twenty billion, four hundred seventy-seven million, six hundred twenty-one thousand, three hundred thirty-one".