20358431 has 2 divisors, whose sum is σ = 20358432. Its totient is φ = 20358430.

The previous prime is 20358421. The next prime is 20358439. The reversal of 20358431 is 13485302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20358431 is a prime.

It is a super-2 number, since 2×20358431² = 828931425563522, which contains 22 as substring.

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 20358431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20358439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10179215 + 10179216.

It is an arithmetic number, because the mean of its divisors is an integer number (10179216).

Almost surely, 2^20358431 is an apocalyptic number.

20358431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20358431 is an equidigital number, since it uses as much as digits as its factorization.

20358431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20358431 is about 4512.0318039659. The cubic root of 20358431 is about 273.0537224263.

The spelling of 20358431 in words is "twenty million, three hundred fifty-eight thousand, four hundred thirty-one".