20952531 has 12 divisors (see below), whose sum is σ = 30321720. Its totient is φ = 13942080.

The previous prime is 20952521. The next prime is 20952539. The reversal of 20952531 is 13525902.

It is not a de Polignac number, because 20952531 - 2⁶ = 20952467 is a prime.

It is a super-2 number, since 2×20952531² = 878017110611922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20952495 and 20952504.

It is not an unprimeable number, because it can be changed into a prime (20952539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3691 + ... + 7451.

It is an arithmetic number, because the mean of its divisors is an integer number (2526810).

Almost surely, 2^20952531 is an apocalyptic number.

20952531 is a deficient number, since it is larger than the sum of its proper divisors (9369189).

20952531 is a wasteful number, since it uses less digits than its factorization.

20952531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4386 (or 4383 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 20952531 is about 4577.3934722722. The cubic root of 20952531 is about 275.6843824419.

The spelling of 20952531 in words is "twenty million, nine hundred fifty-two thousand, five hundred thirty-one".