20749875 has 16 divisors (see below), whose sum is σ = 34528416. Its totient is φ = 11066400.

The previous prime is 20749837. The next prime is 20749879. The reversal of 20749875 is 57894702.

It is not a de Polignac number, because 20749875 - 2⁷ = 20749747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20749879) 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, 27292 + ... + 28041.

It is an arithmetic number, because the mean of its divisors is an integer number (2158026).

Almost surely, 2^20749875 is an apocalyptic number.

20749875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20749875 is a deficient number, since it is larger than the sum of its proper divisors (13778541).

20749875 is an equidigital number, since it uses as much as digits as its factorization.

20749875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55351 (or 55341 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 20749875 is about 4555.2030690190. The cubic root of 20749875 is about 274.7926812100.

The spelling of 20749875 in words is "twenty million, seven hundred forty-nine thousand, eight hundred seventy-five".