20958231 has 12 divisors (see below), whose sum is σ = 32506872. Its totient is φ = 11976048.

The previous prime is 20958211. The next prime is 20958241. The reversal of 20958231 is 13285902.

It is a happy number.

It is not a de Polignac number, because 20958231 - 2¹⁹ = 20433943 is a prime.

It is a super-2 number, since 2×20958231² = 878494893298722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20958211) 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, 71140 + ... + 71433.

It is an arithmetic number, because the mean of its divisors is an integer number (2708906).

Almost surely, 2^20958231 is an apocalyptic number.

20958231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20958231 is a deficient number, since it is larger than the sum of its proper divisors (11548641).

20958231 is a wasteful number, since it uses less digits than its factorization.

20958231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142590 (or 142583 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20958231 is about 4578.0160550177. The cubic root of 20958231 is about 275.7093795573.

The spelling of 20958231 in words is "twenty million, nine hundred fifty-eight thousand, two hundred thirty-one".