20922831 has 12 divisors (see below), whose sum is σ = 30293952. Its totient is φ = 13915296.

The previous prime is 20922829. The next prime is 20922851. The reversal of 20922831 is 13822902.

It is a happy number.

It is not a de Polignac number, because 20922831 - 2¹ = 20922829 is a prime.

It is a super-2 number, since 2×20922831² = 875529714109122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20922795 and 20922804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20922821) 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, 1570 + ... + 6656.

It is an arithmetic number, because the mean of its divisors is an integer number (2524496).

Almost surely, 2^20922831 is an apocalyptic number.

20922831 is a deficient number, since it is larger than the sum of its proper divisors (9371121).

20922831 is a wasteful number, since it uses less digits than its factorization.

20922831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5550 (or 5547 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20922831 is about 4574.1481174094. The cubic root of 20922831 is about 275.5540609081.

The spelling of 20922831 in words is "twenty million, nine hundred twenty-two thousand, eight hundred thirty-one".