20494831 has 16 divisors (see below), whose sum is σ = 24088320. Its totient is φ = 17075520.

The previous prime is 20494829. The next prime is 20494847. The reversal of 20494831 is 13849402.

It is not a de Polignac number, because 20494831 - 2¹ = 20494829 is a prime.

It is a super-2 number, since 2×20494831² = 840076195437122, 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 = 20494793 and 20494802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20492831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41496 + ... + 41986.

It is an arithmetic number, because the mean of its divisors is an integer number (1505520).

Almost surely, 2^20494831 is an apocalyptic number.

20494831 is a deficient number, since it is larger than the sum of its proper divisors (3593489).

20494831 is an equidigital number, since it uses as much as digits as its factorization.

20494831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20494831 is about 4527.1217125233. The cubic root of 20494831 is about 273.6621789004.

The spelling of 20494831 in words is "twenty million, four hundred ninety-four thousand, eight hundred thirty-one".