20091790 has 32 divisors (see below), whose sum is σ = 38841120. Its totient is φ = 7455744.

The previous prime is 20091787. The next prime is 20091791. The reversal of 20091790 is 9719002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20091791) 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, 11601 + ... + 13219.

It is an arithmetic number, because the mean of its divisors is an integer number (1213785).

Almost surely, 2^20091790 is an apocalyptic number.

20091790 is a deficient number, since it is larger than the sum of its proper divisors (18749330).

20091790 is a wasteful number, since it uses less digits than its factorization.

20091790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 20091790 is about 4482.3866410652. The cubic root of 20091790 is about 271.8563886498.

The spelling of 20091790 in words is "twenty million, ninety-one thousand, seven hundred ninety".