20409875 has 16 divisors (see below), whose sum is σ = 25862304. Its totient is φ = 16077600.

The previous prime is 20409859. The next prime is 20409913. The reversal of 20409875 is 57890402.

It is a happy number.

It is not a de Polignac number, because 20409875 - 2⁴ = 20409859 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7157 + ... + 9593.

It is an arithmetic number, because the mean of its divisors is an integer number (1616394).

Almost surely, 2^20409875 is an apocalyptic number.

20409875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20409875 is a deficient number, since it is larger than the sum of its proper divisors (5452429).

20409875 is an equidigital number, since it uses as much as digits as its factorization.

20409875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2519 (or 2509 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20409875 is about 4517.7289648672. The cubic root of 20409875 is about 273.2835233778.

The spelling of 20409875 in words is "twenty million, four hundred nine thousand, eight hundred seventy-five".