20408946 has 16 divisors (see below), whose sum is σ = 41277600. Its totient is φ = 6726368.

The previous prime is 20408917. The next prime is 20408957. The reversal of 20408946 is 64980402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18576 + ... + 19643.

It is an arithmetic number, because the mean of its divisors is an integer number (2579850).

Almost surely, 2^20408946 is an apocalyptic number.

20408946 is an abundant number, since it is smaller than the sum of its proper divisors (20868654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20408946 is a wasteful number, since it uses less digits than its factorization.

20408946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38313.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20408946 is about 4517.6261465509. The cubic root of 20408946 is about 273.2793769496.

The spelling of 20408946 in words is "twenty million, four hundred eight thousand, nine hundred forty-six".