20292990 has 32 divisors (see below), whose sum is σ = 49838976. Its totient is φ = 5285280.

The previous prime is 20292959. The next prime is 20292997. The reversal of 20292990 is 9929202.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20292997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6576 + ... + 9155.

It is an arithmetic number, because the mean of its divisors is an integer number (1557468).

Almost surely, 2^20292990 is an apocalyptic number.

20292990 is an abundant number, since it is smaller than the sum of its proper divisors (29545986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20292990 is a wasteful number, since it uses less digits than its factorization.

20292990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15784.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 20292990 is about 4504.7741341825. The cubic root of 20292990 is about 272.7608365763.

The spelling of 20292990 in words is "twenty million, two hundred ninety-two thousand, nine hundred ninety".