20644526331 has 48 divisors (see below), whose sum is σ = 35054772480. Its totient is φ = 11542253760.

The previous prime is 20644526297. The next prime is 20644526387. The reversal of 20644526331 is 13362544602.

20644526331 is a `hidden beast` number, since 2 + 0 + 644 + 5 + 2 + 6 + 3 + 3 + 1 = 666.

It is not a de Polignac number, because 20644526331 - 2¹⁷ = 20644395259 is a prime.

It is a super-2 number, since 2×20644526331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20644526731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2620260 + ... + 2628126.

It is an arithmetic number, because the mean of its divisors is an integer number (730307760).

Almost surely, 2^20644526331 is an apocalyptic number.

20644526331 is a deficient number, since it is larger than the sum of its proper divisors (14410246149).

20644526331 is a wasteful number, since it uses less digits than its factorization.

20644526331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9936 (or 9933 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 20644526331 in words is "twenty billion, six hundred forty-four million, five hundred twenty-six thousand, three hundred thirty-one".