20626217 has 4 divisors (see below), whose sum is σ = 20740356. Its totient is φ = 20512080.

The previous prime is 20626213. The next prime is 20626231. The reversal of 20626217 is 71262602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8404201 + 12222016 = 2899^2 + 3496^2 .

It is a cyclic number.

It is not a de Polignac number, because 20626217 - 2² = 20626213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20626213) 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, 56798 + ... + 57159.

It is an arithmetic number, because the mean of its divisors is an integer number (5185089).

Almost surely, 2^20626217 is an apocalyptic number.

It is an amenable number.

20626217 is a deficient number, since it is larger than the sum of its proper divisors (114139).

20626217 is a wasteful number, since it uses less digits than its factorization.

20626217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114138.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20626217 is about 4541.6095164600. The cubic root of 20626217 is about 274.2457214627.

Adding to 20626217 its reverse (71262602), we get a palindrome (91888819).

The spelling of 20626217 in words is "twenty million, six hundred twenty-six thousand, two hundred seventeen".