20625550 has 24 divisors (see below), whose sum is σ = 41852232. Its totient is φ = 7500000.

The previous prime is 20625547. The next prime is 20625569. The reversal of 20625550 is 5552602.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 18201 + ... + 19300.

It is an arithmetic number, because the mean of its divisors is an integer number (1743843).

Almost surely, 2^20625550 is an apocalyptic number.

20625550 is an abundant number, since it is smaller than the sum of its proper divisors (21226682).

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

20625550 is a wasteful number, since it uses less digits than its factorization.

20625550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37524 (or 37519 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 20625550 is about 4541.5360837496. The cubic root of 20625550 is about 274.2427652918.

The spelling of 20625550 in words is "twenty million, six hundred twenty-five thousand, five hundred fifty".