20400967 has 2 divisors, whose sum is σ = 20400968. Its totient is φ = 20400966.

The previous prime is 20400959. The next prime is 20400997. The reversal of 20400967 is 76900402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20400967 - 2³ = 20400959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20400997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200483 + 10200484.

It is an arithmetic number, because the mean of its divisors is an integer number (10200484).

Almost surely, 2^20400967 is an apocalyptic number.

20400967 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400967 is an equidigital number, since it uses as much as digits as its factorization.

20400967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20400967 is about 4516.7429636852. The cubic root of 20400967 is about 273.2437589030.

The spelling of 20400967 in words is "twenty million, four hundred thousand, nine hundred sixty-seven".