20408976 has 160 divisors (see below), whose sum is σ = 71066880. Its totient is φ = 5474304.

The previous prime is 20408957. The next prime is 20408987. The reversal of 20408976 is 67980402.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20408976.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51210 + ... + 51606.

It is an arithmetic number, because the mean of its divisors is an integer number (444168).

Almost surely, 2^20408976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20408976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35533440).

20408976 is an abundant number, since it is smaller than the sum of its proper divisors (50657904).

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

20408976 is a wasteful number, since it uses less digits than its factorization.

20408976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20408976 is about 4517.6294668775. The cubic root of 20408976 is about 273.2795108513.

The spelling of 20408976 in words is "twenty million, four hundred eight thousand, nine hundred seventy-six".