20620845 has 32 divisors (see below), whose sum is σ = 41898240. Its totient is φ = 9426240.

The previous prime is 20620843. The next prime is 20620849. The reversal of 20620845 is 54802602.

It is not a de Polignac number, because 20620845 - 2¹ = 20620843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9966 + ... + 11855.

It is an arithmetic number, because the mean of its divisors is an integer number (1309320).

Almost surely, 2^20620845 is an apocalyptic number.

It is an amenable number.

20620845 is an abundant number, since it is smaller than the sum of its proper divisors (21277395).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20620845 is a wasteful number, since it uses less digits than its factorization.

20620845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21842 (or 21836 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20620845 is about 4541.0180576606. The cubic root of 20620845 is about 274.2219107313.

The spelling of 20620845 in words is "twenty million, six hundred twenty thousand, eight hundred forty-five".