20920408 has 8 divisors (see below), whose sum is σ = 39225780. Its totient is φ = 10460200.

The previous prime is 20920391. The next prime is 20920411. The reversal of 20920408 is 80402902.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1307518 + ... + 1307533.

Almost surely, 2^20920408 is an apocalyptic number.

It is an amenable number.

20920408 is a deficient number, since it is larger than the sum of its proper divisors (18305372).

20920408 is a wasteful number, since it uses less digits than its factorization.

20920408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2615057 (or 2615053 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20920408 is about 4573.8832516801. The cubic root of 20920408 is about 275.5434235130.

The spelling of 20920408 in words is "twenty million, nine hundred twenty thousand, four hundred eight".