20799731 has 2 divisors, whose sum is σ = 20799732. Its totient is φ = 20799730.

The previous prime is 20799689. The next prime is 20799733. The reversal of 20799731 is 13799702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20799731 - 2¹⁰ = 20798707 is a prime.

It is a super-2 number, since 2×20799731² = 865257619344722, which contains 22 as substring.

Together with 20799733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20799733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10399865 + 10399866.

It is an arithmetic number, because the mean of its divisors is an integer number (10399866).

Almost surely, 2^20799731 is an apocalyptic number.

20799731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20799731 is an equidigital number, since it uses as much as digits as its factorization.

20799731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 20799731 is about 4560.6722092253. The cubic root of 20799731 is about 275.0125878535.

The spelling of 20799731 in words is "twenty million, seven hundred ninety-nine thousand, seven hundred thirty-one".