20531532 has 24 divisors (see below), whose sum is σ = 54750976. Its totient is φ = 5866128.

The previous prime is 20531521. The next prime is 20531543. The reversal of 20531532 is 23513502.

It is an interprime number because it is at equal distance from previous prime (20531521) and next prime (20531543).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20531499 and 20531508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122128 + ... + 122295.

Almost surely, 2^20531532 is an apocalyptic number.

It is an amenable number.

20531532 is an abundant number, since it is smaller than the sum of its proper divisors (34219444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20531532 is a wasteful number, since it uses less digits than its factorization.

20531532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244437 (or 244435 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 20531532 is about 4531.1733579725. The cubic root of 20531532 is about 273.8254344771.

The spelling of 20531532 in words is "twenty million, five hundred thirty-one thousand, five hundred thirty-two".