20535331531 has 16 divisors (see below), whose sum is σ = 24173856000. Its totient is φ = 17197852320.

The previous prime is 20535331529. The next prime is 20535331541. The reversal of 20535331531 is 13513353502.

It is not a de Polignac number, because 20535331531 - 2¹ = 20535331529 is a prime.

It is a super-2 number, since 2×20535331531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20535331493 and 20535331502.

It is not an unprimeable number, because it can be changed into a prime (20535331541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72535 + ... + 215248.

It is an arithmetic number, because the mean of its divisors is an integer number (1510866000).

Almost surely, 2^20535331531 is an apocalyptic number.

20535331531 is a deficient number, since it is larger than the sum of its proper divisors (3638524469).

20535331531 is a wasteful number, since it uses less digits than its factorization.

20535331531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288306.

The product of its (nonzero) digits is 20250, while the sum is 31.

The spelling of 20535331531 in words is "twenty billion, five hundred thirty-five million, three hundred thirty-one thousand, five hundred thirty-one".