20913375 has 64 divisors (see below), whose sum is σ = 41213952. Its totient is φ = 9216000.

The previous prime is 20913367. The next prime is 20913377. The reversal of 20913375 is 57331902.

It is not a de Polignac number, because 20913375 - 2³ = 20913367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20913377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 81247 + ... + 81503.

It is an arithmetic number, because the mean of its divisors is an integer number (643968).

Almost surely, 2^20913375 is an apocalyptic number.

20913375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20913375 is a deficient number, since it is larger than the sum of its proper divisors (20300577).

20913375 is a wasteful number, since it uses less digits than its factorization.

20913375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 20913375 is about 4573.1143655063. The cubic root of 20913375 is about 275.5125427561.

The spelling of 20913375 in words is "twenty million, nine hundred thirteen thousand, three hundred seventy-five".