20409308 has 12 divisors (see below), whose sum is σ = 36587712. Its totient is φ = 9955680.

The previous prime is 20409283. The next prime is 20409317. The reversal of 20409308 is 80390402.

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, 62060 + ... + 62387.

It is an arithmetic number, because the mean of its divisors is an integer number (3048976).

Almost surely, 2^20409308 is an apocalyptic number.

It is an amenable number.

20409308 is a deficient number, since it is larger than the sum of its proper divisors (16178404).

20409308 is a wasteful number, since it uses less digits than its factorization.

20409308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124492 (or 124490 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20409308 is about 4517.6662116628. Note that the first 3 decimals coincide. The cubic root of 20409308 is about 273.2809926879.

The spelling of 20409308 in words is "twenty million, four hundred nine thousand, three hundred eight".