20308790 has 8 divisors (see below), whose sum is σ = 36555840. Its totient is φ = 8123512.

The previous prime is 20308789. The next prime is 20308823. The reversal of 20308790 is 9780302.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1015430 + ... + 1015449.

It is an arithmetic number, because the mean of its divisors is an integer number (4569480).

Almost surely, 2^20308790 is an apocalyptic number.

20308790 is a deficient number, since it is larger than the sum of its proper divisors (16247050).

20308790 is a wasteful number, since it uses less digits than its factorization.

20308790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030886.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20308790 is about 4506.5274879890. The cubic root of 20308790 is about 272.8316081945.

The spelling of 20308790 in words is "twenty million, three hundred eight thousand, seven hundred ninety".