20178125 has 24 divisors (see below), whose sum is σ = 27560736. Its totient is φ = 14650000.

The previous prime is 20178097. The next prime is 20178139. The reversal of 20178125 is 52187102.

It is not a de Polignac number, because 20178125 - 2²⁰ = 19129549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20178094 and 20178103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34082 + ... + 34668.

It is an arithmetic number, because the mean of its divisors is an integer number (1148364).

Almost surely, 2^20178125 is an apocalyptic number.

20178125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20178125 is a deficient number, since it is larger than the sum of its proper divisors (7382611).

20178125 is an frugal number, since it uses more digits than its factorization.

20178125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 603 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 20178125 is about 4492.0067898435. The cubic root of 20178125 is about 272.2452238111.

The spelling of 20178125 in words is "twenty million, one hundred seventy-eight thousand, one hundred twenty-five".