20622517 has 4 divisors (see below), whose sum is σ = 20637216. Its totient is φ = 20607820.

The previous prime is 20622487. The next prime is 20622529. The reversal of 20622517 is 71522602.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71522602 = 2 ⋅35761301.

It is a cyclic number.

It is not a de Polignac number, because 20622517 - 2⁷ = 20622389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20622491 and 20622500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20622317) 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, 4993 + ... + 8134.

It is an arithmetic number, because the mean of its divisors is an integer number (5159304).

Almost surely, 2^20622517 is an apocalyptic number.

It is an amenable number.

20622517 is a deficient number, since it is larger than the sum of its proper divisors (14699).

20622517 is a wasteful number, since it uses less digits than its factorization.

20622517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14698.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20622517 is about 4541.2021536153. The cubic root of 20622517 is about 274.2293221095.

The spelling of 20622517 in words is "twenty million, six hundred twenty-two thousand, five hundred seventeen".