20423808 has 48 divisors (see below), whose sum is σ = 58774950. Its totient is φ = 6807552.

The previous prime is 20423773. The next prime is 20423813. The reversal of 20423808 is 80832402.

It can be written as a sum of positive squares in only one way, i.e., 16064064 + 4359744 = 4008^2 + 2088^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7713 + ... + 10016.

Almost surely, 2^20423808 is an apocalyptic number.

It is an amenable number.

20423808 is an abundant number, since it is smaller than the sum of its proper divisors (38351142).

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

20423808 is a wasteful number, since it uses less digits than its factorization.

20423808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17749 (or 17734 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20423808 is about 4519.2707376301. The cubic root of 20423808 is about 273.3456957856.

The spelling of 20423808 in words is "twenty million, four hundred twenty-three thousand, eight hundred eight".