20651417 has 4 divisors (see below), whose sum is σ = 20696676. Its totient is φ = 20606160.

The previous prime is 20651381. The next prime is 20651419. The reversal of 20651417 is 71415602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71415602 = 2 ⋅35707801.

It can be written as a sum of positive squares in 2 ways, for example, as 6370576 + 14280841 = 2524^2 + 3779^2 .

It is a cyclic number.

It is not a de Polignac number, because 20651417 - 2⁶ = 20651353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20651419) 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, 21938 + ... + 22859.

It is an arithmetic number, because the mean of its divisors is an integer number (5174169).

Almost surely, 2^20651417 is an apocalyptic number.

It is an amenable number.

20651417 is a deficient number, since it is larger than the sum of its proper divisors (45259).

20651417 is an equidigital number, since it uses as much as digits as its factorization.

20651417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45258.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20651417 is about 4544.3830164281. The cubic root of 20651417 is about 274.3573622222.

The spelling of 20651417 in words is "twenty million, six hundred fifty-one thousand, four hundred seventeen".