20345031 has 24 divisors (see below), whose sum is σ = 34305024. Its totient is φ = 11376720.

The previous prime is 20345023. The next prime is 20345033. The reversal of 20345031 is 13054302.

It is not a de Polignac number, because 20345031 - 2³ = 20345023 is a prime.

It is a super-2 number, since 2×20345031² = 827840572781922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20344995 and 20345013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345033) 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 23 ways as a sum of consecutive naturals, for example, 475 + ... + 6396.

It is an arithmetic number, because the mean of its divisors is an integer number (1429376).

Almost surely, 2^20345031 is an apocalyptic number.

20345031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20345031 is a deficient number, since it is larger than the sum of its proper divisors (13959993).

20345031 is a wasteful number, since it uses less digits than its factorization.

20345031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6931 (or 6928 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20345031 is about 4510.5466409295. The cubic root of 20345031 is about 272.9938009300.

Adding to 20345031 its reverse (13054302), we get a palindrome (33399333).

The spelling of 20345031 in words is "twenty million, three hundred forty-five thousand, thirty-one".