20763931 has 2 divisors, whose sum is σ = 20763932. Its totient is φ = 20763930.

The previous prime is 20763923. The next prime is 20763937. The reversal of 20763931 is 13936702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20763931 - 2³ = 20763923 is a prime.

It is a super-2 number, since 2×20763931² = 862281661145522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20763893 and 20763902.

It is not a weakly prime, because it can be changed into another prime (20763937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10381965 + 10381966.

It is an arithmetic number, because the mean of its divisors is an integer number (10381966).

Almost surely, 2^20763931 is an apocalyptic number.

20763931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20763931 is an equidigital number, since it uses as much as digits as its factorization.

20763931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 20763931 is about 4556.7456589105. The cubic root of 20763931 is about 274.8547155452.

The spelling of 20763931 in words is "twenty million, seven hundred sixty-three thousand, nine hundred thirty-one".