20292731 has 2 divisors, whose sum is σ = 20292732. Its totient is φ = 20292730.

The previous prime is 20292719. The next prime is 20292733. The reversal of 20292731 is 13729202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20292731 - 2⁶ = 20292667 is a prime.

It is a super-2 number, since 2×20292731² = 823589862876722, which contains 22 as substring.

Together with 20292733, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20292731.

It is not a weakly prime, because it can be changed into another prime (20292733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10146365 + 10146366.

It is an arithmetic number, because the mean of its divisors is an integer number (10146366).

Almost surely, 2^20292731 is an apocalyptic number.

20292731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20292731 is an equidigital number, since it uses as much as digits as its factorization.

20292731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20292731 is about 4504.7453868116. The cubic root of 20292731 is about 272.7596761533.

The spelling of 20292731 in words is "twenty million, two hundred ninety-two thousand, seven hundred thirty-one".