20612990 has 16 divisors (see below), whose sum is σ = 37445760. Its totient is φ = 8169120.

The previous prime is 20612957. The next prime is 20613029. The reversal of 20612990 is 9921602.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8366 + ... + 10545.

It is an arithmetic number, because the mean of its divisors is an integer number (2340360).

Almost surely, 2^20612990 is an apocalyptic number.

20612990 is a deficient number, since it is larger than the sum of its proper divisors (16832770).

20612990 is a wasteful number, since it uses less digits than its factorization.

20612990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19027.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 20612990 is about 4540.1530811196. The cubic root of 20612990 is about 274.1870869616.

The spelling of 20612990 in words is "twenty million, six hundred twelve thousand, nine hundred ninety".