20875540 has 24 divisors (see below), whose sum is σ = 50101632. Its totient is φ = 7157280.

The previous prime is 20875531. The next prime is 20875549. The reversal of 20875540 is 4557802.

It is an interprime number because it is at equal distance from previous prime (20875531) and next prime (20875549).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20875549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74416 + ... + 74695.

It is an arithmetic number, because the mean of its divisors is an integer number (2087568).

Almost surely, 2^20875540 is an apocalyptic number.

20875540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20875540 is an abundant number, since it is smaller than the sum of its proper divisors (29226092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20875540 is a wasteful number, since it uses less digits than its factorization.

20875540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149127 (or 149125 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 20875540 is about 4568.9758152129. The cubic root of 20875540 is about 275.3462965219.

The spelling of 20875540 in words is "twenty million, eight hundred seventy-five thousand, five hundred forty".