20252505 has 64 divisors (see below), whose sum is σ = 41061888. Its totient is φ = 8294400.

The previous prime is 20252503. The next prime is 20252509. The reversal of 20252505 is 50525202.

It is not a de Polignac number, because 20252505 - 2¹ = 20252503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20252501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50305 + ... + 50705.

It is an arithmetic number, because the mean of its divisors is an integer number (641592).

Almost surely, 2^20252505 is an apocalyptic number.

It is an amenable number.

20252505 is an abundant number, since it is smaller than the sum of its proper divisors (20809383).

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

20252505 is a wasteful number, since it uses less digits than its factorization.

20252505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466.

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 20252505 is about 4500.2783247261. The cubic root of 20252505 is about 272.5793276888.

Adding to 20252505 its reverse (50525202), we get a palindrome (70777707).

The spelling of 20252505 in words is "twenty million, two hundred fifty-two thousand, five hundred five".