20717144 has 32 divisors (see below), whose sum is σ = 46732800. Its totient is φ = 8411040.

The previous prime is 20717143. The next prime is 20717149. The reversal of 20717144 is 44171702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8672 + ... + 10799.

It is an arithmetic number, because the mean of its divisors is an integer number (1460400).

Almost surely, 2^20717144 is an apocalyptic number.

It is an amenable number.

20717144 is an abundant number, since it is smaller than the sum of its proper divisors (26015656).

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

20717144 is a wasteful number, since it uses less digits than its factorization.

20717144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19503 (or 19499 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 20717144 is about 4551.6089462958. The cubic root of 20717144 is about 274.6481185305.

Adding to 20717144 its reverse (44171702), we get a palindrome (64888846).

The spelling of 20717144 in words is "twenty million, seven hundred seventeen thousand, one hundred forty-four".