20620647 has 6 divisors (see below), whose sum is σ = 29785392. Its totient is φ = 13747092.

The previous prime is 20620637. The next prime is 20620651. The reversal of 20620647 is 74602602.

It is not a de Polignac number, because 20620647 - 2⁶ = 20620583 is a prime.

It is a super-2 number, since 2×20620647² = 850422165397218, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20620647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620637) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1145583 + ... + 1145600.

It is an arithmetic number, because the mean of its divisors is an integer number (4964232).

Almost surely, 2^20620647 is an apocalyptic number.

20620647 is a deficient number, since it is larger than the sum of its proper divisors (9164745).

20620647 is a wasteful number, since it uses less digits than its factorization.

20620647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291189 (or 2291186 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20620647 is about 4540.9962563297. The cubic root of 20620647 is about 274.2210330416.

The spelling of 20620647 in words is "twenty million, six hundred twenty thousand, six hundred forty-seven".