20466405 has 16 divisors (see below), whose sum is σ = 36384960. Its totient is φ = 10915344.

The previous prime is 20466377. The next prime is 20466437. The reversal of 20466405 is 50466402.

It is a happy number.

It is not a de Polignac number, because 20466405 - 2¹¹ = 20464357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75667 + ... + 75936.

It is an arithmetic number, because the mean of its divisors is an integer number (2274060).

Almost surely, 2^20466405 is an apocalyptic number.

It is an amenable number.

20466405 is a deficient number, since it is larger than the sum of its proper divisors (15918555).

20466405 is a wasteful number, since it uses less digits than its factorization.

20466405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151617 (or 151611 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20466405 is about 4523.9811007563. The cubic root of 20466405 is about 273.5355986848.

The spelling of 20466405 in words is "twenty million, four hundred sixty-six thousand, four hundred five".