20624669 has 4 divisors (see below), whose sum is σ = 22211196. Its totient is φ = 19038144.

The previous prime is 20624663. The next prime is 20624693. The reversal of 20624669 is 96642602.

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 7628644 + 12996025 = 2762^2 + 3605^2 .

It is a cyclic number.

It is not a de Polignac number, because 20624669 - 2¹² = 20620573 is a prime.

It is a super-2 number, since 2×20624669² = 850753942719122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20624663) 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, 793244 + ... + 793269.

It is an arithmetic number, because the mean of its divisors is an integer number (5552799).

Almost surely, 2^20624669 is an apocalyptic number.

It is an amenable number.

20624669 is a deficient number, since it is larger than the sum of its proper divisors (1586527).

20624669 is a wasteful number, since it uses less digits than its factorization.

20624669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586526.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 20624669 is about 4541.4390890994. The cubic root of 20624669 is about 274.2388605665.

The spelling of 20624669 in words is "twenty million, six hundred twenty-four thousand, six hundred sixty-nine".