20926831 has 2 divisors, whose sum is σ = 20926832. Its totient is φ = 20926830.

The previous prime is 20926817. The next prime is 20926859. The reversal of 20926831 is 13862902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20926831 - 2⁹ = 20926319 is a prime.

It is a super-2 number, since 2×20926831² = 875864511405122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20926793 and 20926802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20926811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10463415 + 10463416.

It is an arithmetic number, because the mean of its divisors is an integer number (10463416).

Almost surely, 2^20926831 is an apocalyptic number.

20926831 is a deficient number, since it is larger than the sum of its proper divisors (1).

20926831 is an equidigital number, since it uses as much as digits as its factorization.

20926831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20926831 is about 4574.5853363994. The cubic root of 20926831 is about 275.5716198132.

The spelling of 20926831 in words is "twenty million, nine hundred twenty-six thousand, eight hundred thirty-one".