20772917 has 8 divisors (see below), whose sum is σ = 22850112. Its totient is φ = 18883260.

The previous prime is 20772911. The next prime is 20772923. The reversal of 20772917 is 71927702.

It is an interprime number because it is at equal distance from previous prime (20772911) and next prime (20772923).

It is not a de Polignac number, because 20772917 - 2⁴ = 20772901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20772911) 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, 6473 + ... + 9134.

It is an arithmetic number, because the mean of its divisors is an integer number (2856264).

Almost surely, 2^20772917 is an apocalyptic number.

It is an amenable number.

20772917 is a deficient number, since it is larger than the sum of its proper divisors (2077195).

20772917 is an equidigital number, since it uses as much as digits as its factorization.

20772917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15640 (or 15618 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 20772917 is about 4557.7315629598. The cubic root of 20772917 is about 274.8943594236.

It can be divided in two parts, 2077 and 2917, that added together give a palindrome (4994).

The spelling of 20772917 in words is "twenty million, seven hundred seventy-two thousand, nine hundred seventeen".