20125501 has 16 divisors (see below), whose sum is σ = 23390208. Its totient is φ = 17113600.

The previous prime is 20125471. The next prime is 20125513. The reversal of 20125501 is 10552102.

It is a cyclic number.

It is not a de Polignac number, because 20125501 - 2¹³ = 20117309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20125601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52356 + ... + 52738.

It is an arithmetic number, because the mean of its divisors is an integer number (1461888).

Almost surely, 2^20125501 is an apocalyptic number.

It is an amenable number.

20125501 is a deficient number, since it is larger than the sum of its proper divisors (3264707).

20125501 is a wasteful number, since it uses less digits than its factorization.

20125501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 20125501 is about 4486.1454501610. The cubic root of 20125501 is about 272.0083483957.

Adding to 20125501 its reverse (10552102), we get a palindrome (30677603).

It can be divided in two parts, 20 and 125501, that added together give a palindrome (125521).

The spelling of 20125501 in words is "twenty million, one hundred twenty-five thousand, five hundred one".