20019975 has 12 divisors (see below), whose sum is σ = 33099816. Its totient is φ = 10677280.

The previous prime is 20019973. The next prime is 20020001. The reversal of 20019975 is 57991002.

It is not a de Polignac number, because 20019975 - 2¹ = 20019973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20019971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133392 + ... + 133541.

It is an arithmetic number, because the mean of its divisors is an integer number (2758318).

Almost surely, 2^20019975 is an apocalyptic number.

20019975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20019975 is a deficient number, since it is larger than the sum of its proper divisors (13079841).

20019975 is a wasteful number, since it uses less digits than its factorization.

20019975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266946 (or 266941 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 20019975 is about 4474.3686705501. The cubic root of 20019975 is about 271.5320990778.

It can be divided in two parts, 2001997 and 5, that added together give a palindrome (2002002).

The spelling of 20019975 in words is "twenty million, nineteen thousand, nine hundred seventy-five".