20533847831 has 24 divisors (see below), whose sum is σ = 24196004784. Its totient is φ = 17372638080.

The previous prime is 20533847809. The next prime is 20533847849. The reversal of 20533847831 is 13874833502.

It is not a de Polignac number, because 20533847831 - 2⁶ = 20533847767 is a prime.

It is a super-2 number, since 2×20533847831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20533847881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7567331 + ... + 7570043.

It is an arithmetic number, because the mean of its divisors is an integer number (1008166866).

Almost surely, 2^20533847831 is an apocalyptic number.

20533847831 is a deficient number, since it is larger than the sum of its proper divisors (3662156953).

20533847831 is a wasteful number, since it uses less digits than its factorization.

20533847831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4671 (or 4664 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 20533847831 in words is "twenty billion, five hundred thirty-three million, eight hundred forty-seven thousand, eight hundred thirty-one".