20339831 has 2 divisors, whose sum is σ = 20339832. Its totient is φ = 20339830.

The previous prime is 20339819. The next prime is 20339849. The reversal of 20339831 is 13893302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20339831 - 2¹⁰ = 20338807 is a prime.

It is a super-2 number, since 2×20339831² = 827417450217122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20339794 and 20339803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20339801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10169915 + 10169916.

It is an arithmetic number, because the mean of its divisors is an integer number (10169916).

Almost surely, 2^20339831 is an apocalyptic number.

20339831 is a deficient number, since it is larger than the sum of its proper divisors (1).

20339831 is an equidigital number, since it uses as much as digits as its factorization.

20339831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20339831 is about 4509.9701772850. The cubic root of 20339831 is about 272.9705407258.

The spelling of 20339831 in words is "twenty million, three hundred thirty-nine thousand, eight hundred thirty-one".