20662531 has 8 divisors (see below), whose sum is σ = 21934800. Its totient is φ = 19396608.

The previous prime is 20662517. The next prime is 20662547. The reversal of 20662531 is 13526602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20662531 - 2¹¹ = 20660483 is a prime.

It is a super-2 number, since 2×20662531² = 853880374651922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20662496 and 20662505.

It is not an unprimeable number, because it can be changed into a prime (20662501) by changing a digit.

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, 6280 + ... + 8986.

It is an arithmetic number, because the mean of its divisors is an integer number (2741850).

Almost surely, 2^20662531 is an apocalyptic number.

20662531 is a deficient number, since it is larger than the sum of its proper divisors (1272269).

20662531 is a wasteful number, since it uses less digits than its factorization.

20662531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20662531 is about 4545.6056802147. The cubic root of 20662531 is about 274.4065704822.

The spelling of 20662531 in words is "twenty million, six hundred sixty-two thousand, five hundred thirty-one".