20625870 has 48 divisors (see below), whose sum is σ = 50862960. Its totient is φ = 5352960.

The previous prime is 20625841. The next prime is 20625877. The reversal of 20625870 is 7852602.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20625877) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50226 + ... + 50634.

It is an arithmetic number, because the mean of its divisors is an integer number (1059645).

Almost surely, 2^20625870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20625870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25431480).

20625870 is an abundant number, since it is smaller than the sum of its proper divisors (30237090).

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

20625870 is a wasteful number, since it uses less digits than its factorization.

20625870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 20625870 is about 4541.5713139837. The cubic root of 20625870 is about 274.2441835526.

The spelling of 20625870 in words is "twenty million, six hundred twenty-five thousand, eight hundred seventy".