20317790 has 8 divisors (see below), whose sum is σ = 36572040. Its totient is φ = 8127112.

The previous prime is 20317757. The next prime is 20317799. The reversal of 20317790 is 9771302.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20317799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1015880 + ... + 1015899.

It is an arithmetic number, because the mean of its divisors is an integer number (4571505).

Almost surely, 2^20317790 is an apocalyptic number.

20317790 is a deficient number, since it is larger than the sum of its proper divisors (16254250).

20317790 is a wasteful number, since it uses less digits than its factorization.

20317790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031786.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 20317790 is about 4507.5259289326. The cubic root of 20317790 is about 272.8719047334.

The spelling of 20317790 in words is "twenty million, three hundred seventeen thousand, seven hundred ninety".