20431679 has 2 divisors, whose sum is σ = 20431680. Its totient is φ = 20431678.

The previous prime is 20431673. The next prime is 20431687. The reversal of 20431679 is 97613402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20431679 - 2⁸ = 20431423 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20431673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215839 + 10215840.

It is an arithmetic number, because the mean of its divisors is an integer number (10215840).

Almost surely, 2^20431679 is an apocalyptic number.

20431679 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431679 is an equidigital number, since it uses as much as digits as its factorization.

20431679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20431679 is about 4520.1414800867. The cubic root of 20431679 is about 273.3808055889.

The spelling of 20431679 in words is "twenty million, four hundred thirty-one thousand, six hundred seventy-nine".