20764417 has 4 divisors (see below), whose sum is σ = 20923056. Its totient is φ = 20605780.

The previous prime is 20764369. The next prime is 20764421. The reversal of 20764417 is 71446702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20764417 - 2¹¹ = 20762369 is a prime.

It is a super-2 number, since 2×20764417² = 862322026699778, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20764427) 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, 79123 + ... + 79384.

It is an arithmetic number, because the mean of its divisors is an integer number (5230764).

Almost surely, 2^20764417 is an apocalyptic number.

It is an amenable number.

20764417 is a deficient number, since it is larger than the sum of its proper divisors (158639).

20764417 is a wasteful number, since it uses less digits than its factorization.

20764417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158638.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 20764417 is about 4556.7989861305. The cubic root of 20764417 is about 274.8568599425.

The spelling of 20764417 in words is "twenty million, seven hundred sixty-four thousand, four hundred seventeen".