20426839 has 2 divisors, whose sum is σ = 20426840. Its totient is φ = 20426838.

The previous prime is 20426831. The next prime is 20426851. The reversal of 20426839 is 93862402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20426839 - 2³ = 20426831 is a prime.

It is equal to p_1295926 and since 20426839 and 1295926 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20426831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10213419 + 10213420.

It is an arithmetic number, because the mean of its divisors is an integer number (10213420).

Almost surely, 2^20426839 is an apocalyptic number.

20426839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20426839 is an equidigital number, since it uses as much as digits as its factorization.

20426839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 20426839 is about 4519.6060669045. The cubic root of 20426839 is about 273.3592170941.

The spelling of 20426839 in words is "twenty million, four hundred twenty-six thousand, eight hundred thirty-nine".