20400719 has 2 divisors, whose sum is σ = 20400720. Its totient is φ = 20400718.

The previous prime is 20400713. The next prime is 20400803. The reversal of 20400719 is 91700402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20400719 - 2⁸ = 20400463 is a prime.

It is a super-2 number, since 2×20400719² = 832378671433922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20400694 and 20400703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20400713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200359 + 10200360.

It is an arithmetic number, because the mean of its divisors is an integer number (10200360).

Almost surely, 2^20400719 is an apocalyptic number.

20400719 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400719 is an equidigital number, since it uses as much as digits as its factorization.

20400719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 20400719 is about 4516.7155101910. The cubic root of 20400719 is about 273.2426516887.

The spelling of 20400719 in words is "twenty million, four hundred thousand, seven hundred nineteen".