20317970 has 16 divisors (see below), whose sum is σ = 38162880. Its totient is φ = 7773744.

The previous prime is 20317967. The next prime is 20317981. The reversal of 20317970 is 7971302.

It is a happy 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, 43940 + ... + 44399.

It is an arithmetic number, because the mean of its divisors is an integer number (2385180).

Almost surely, 2^20317970 is an apocalyptic number.

20317970 is a deficient number, since it is larger than the sum of its proper divisors (17844910).

20317970 is a wasteful number, since it uses less digits than its factorization.

20317970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88369.

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

The square root of 20317970 is about 4507.5458954957. The cubic root of 20317970 is about 272.8727105428.

It can be divided in two parts, 2031 and 7970, that added together give a palindrome (10001).

The spelling of 20317970 in words is "twenty million, three hundred seventeen thousand, nine hundred seventy".