20125415 has 4 divisors (see below), whose sum is σ = 24150504. Its totient is φ = 16100328.

The previous prime is 20125411. The next prime is 20125439. The reversal of 20125415 is 51452102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20125415 - 2² = 20125411 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 (20125411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012537 + ... + 2012546.

It is an arithmetic number, because the mean of its divisors is an integer number (6037626).

Almost surely, 2^20125415 is an apocalyptic number.

20125415 is a deficient number, since it is larger than the sum of its proper divisors (4025089).

20125415 is an equidigital number, since it uses as much as digits as its factorization.

20125415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4025088.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 20125415 is about 4486.1358650848. The cubic root of 20125415 is about 272.0079609478.

Adding to 20125415 its reverse (51452102), we get a palindrome (71577517).

The spelling of 20125415 in words is "twenty million, one hundred twenty-five thousand, four hundred fifteen".