20005522531 has 16 divisors (see below), whose sum is σ = 21280530816. Its totient is φ = 18741574656.

The previous prime is 20005522519. The next prime is 20005522543. The reversal of 20005522531 is 13522550002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20005522519) and next prime (20005522543).

It is not a de Polignac number, because 20005522531 - 2²⁵ = 19971968099 is a prime.

It is a super-2 number, since 2×20005522531² (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 = 20005522496 and 20005522505.

It is not an unprimeable number, because it can be changed into a prime (20005522231) 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, 7000855 + ... + 7003711.

It is an arithmetic number, because the mean of its divisors is an integer number (1330033176).

Almost surely, 2^20005522531 is an apocalyptic number.

20005522531 is a deficient number, since it is larger than the sum of its proper divisors (1275008285).

20005522531 is a wasteful number, since it uses less digits than its factorization.

20005522531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4638.

The product of its (nonzero) digits is 3000, while the sum is 25.

The spelling of 20005522531 in words is "twenty billion, five million, five hundred twenty-two thousand, five hundred thirty-one".