20836931 has 2 divisors, whose sum is σ = 20836932. Its totient is φ = 20836930.

The previous prime is 20836927. The next prime is 20836967. The reversal of 20836931 is 13963802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20836931 - 2² = 20836927 is a prime.

It is a super-2 number, since 2×20836931² = 868355386997522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20836631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10418465 + 10418466.

It is an arithmetic number, because the mean of its divisors is an integer number (10418466).

Almost surely, 2^20836931 is an apocalyptic number.

20836931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20836931 is an equidigital number, since it uses as much as digits as its factorization.

20836931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20836931 is about 4564.7487335011. The cubic root of 20836931 is about 275.1764421410.

The spelling of 20836931 in words is "twenty million, eight hundred thirty-six thousand, nine hundred thirty-one".