20626901 has 4 divisors (see below), whose sum is σ = 20647404. Its totient is φ = 20606400.

The previous prime is 20626897. The next prime is 20626909. The reversal of 20626901 is 10962602.

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 9060100 + 11566801 = 3010^2 + 3401^2 .

It is a cyclic number.

It is not a de Polignac number, because 20626901 - 2² = 20626897 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 (20626909) 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, 8660 + ... + 10781.

It is an arithmetic number, because the mean of its divisors is an integer number (5161851).

Almost surely, 2^20626901 is an apocalyptic number.

It is an amenable number.

20626901 is a deficient number, since it is larger than the sum of its proper divisors (20503).

20626901 is a wasteful number, since it uses less digits than its factorization.

20626901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20502.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 20626901 is about 4541.6848195356. The cubic root of 20626901 is about 274.2487529121.

The spelling of 20626901 in words is "twenty million, six hundred twenty-six thousand, nine hundred one".