20428375 has 32 divisors (see below), whose sum is σ = 28304640. Its totient is φ = 14596000.

The previous prime is 20428319. The next prime is 20428379. The reversal of 20428375 is 57382402.

It is not a de Polignac number, because 20428375 - 2²³ = 12039767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20428379) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114036 + ... + 114214.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^20428375 is an apocalyptic number.

20428375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20428375 is a deficient number, since it is larger than the sum of its proper divisors (7876265).

20428375 is a wasteful number, since it uses less digits than its factorization.

20428375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 20428375 is about 4519.7759900243. The cubic root of 20428375 is about 273.3660686882.

The spelling of 20428375 in words is "twenty million, four hundred twenty-eight thousand, three hundred seventy-five".