20914331 has 4 divisors (see below), whose sum is σ = 20990112. Its totient is φ = 20838552.

The previous prime is 20914321. The next prime is 20914339. The reversal of 20914331 is 13341902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20914331 - 2¹⁸ = 20652187 is a prime.

It is a super-2 number, since 2×20914331² = 874818482355122, 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 = 20914297 and 20914306.

It is not an unprimeable number, because it can be changed into a prime (20914339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37475 + ... + 38028.

It is an arithmetic number, because the mean of its divisors is an integer number (5247528).

Almost surely, 2^20914331 is an apocalyptic number.

20914331 is a deficient number, since it is larger than the sum of its proper divisors (75781).

20914331 is an equidigital number, since it uses as much as digits as its factorization.

20914331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75780.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20914331 is about 4573.2188882668. The cubic root of 20914331 is about 275.5167408029.

The spelling of 20914331 in words is "twenty million, nine hundred fourteen thousand, three hundred thirty-one".