20401125 has 16 divisors (see below), whose sum is σ = 33948096. Its totient is φ = 10880400.

The previous prime is 20401111. The next prime is 20401127. The reversal of 20401125 is 52110402.

It is not a de Polignac number, because 20401125 - 2⁴ = 20401109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401127) 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, 26827 + ... + 27576.

It is an arithmetic number, because the mean of its divisors is an integer number (2121756).

Almost surely, 2^20401125 is an apocalyptic number.

20401125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20401125 is a deficient number, since it is larger than the sum of its proper divisors (13546971).

20401125 is an equidigital number, since it uses as much as digits as its factorization.

20401125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54421 (or 54411 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 20401125 is about 4516.7604541308. The cubic root of 20401125 is about 273.2444643010.

Adding to 20401125 its reverse (52110402), we get a palindrome (72511527).

The spelling of 20401125 in words is "twenty million, four hundred one thousand, one hundred twenty-five".