20531522 has 24 divisors (see below), whose sum is σ = 34781628. Its totient is φ = 9076320.

The previous prime is 20531521. The next prime is 20531543. The reversal of 20531522 is 22513502.

It can be written as a sum of positive squares in 2 ways, for example, as 20241001 + 290521 = 4499^2 + 539^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20531494 and 20531503.

It is not an unprimeable number, because it can be changed into a prime (20531521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7808 + ... + 10100.

Almost surely, 2^20531522 is an apocalyptic number.

20531522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20531522 is a deficient number, since it is larger than the sum of its proper divisors (14250106).

20531522 is a wasteful number, since it uses less digits than its factorization.

20531522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354 (or 2343 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20531522 is about 4531.1722545054. The cubic root of 20531522 is about 273.8253900210.

The spelling of 20531522 in words is "twenty million, five hundred thirty-one thousand, five hundred twenty-two".