20749808 has 20 divisors (see below), whose sum is σ = 40303968. Its totient is φ = 10348800.

The previous prime is 20749789. The next prime is 20749831. The reversal of 20749808 is 80894702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6008 + ... + 8808.

Almost surely, 2^20749808 is an apocalyptic number.

It is an amenable number.

20749808 is a deficient number, since it is larger than the sum of its proper divisors (19554160).

20749808 is a wasteful number, since it uses less digits than its factorization.

20749808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3272 (or 3266 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20749808 is about 4555.1957147855. The cubic root of 20749808 is about 274.7923854471.

The spelling of 20749808 in words is "twenty million, seven hundred forty-nine thousand, eight hundred eight".