20990175 has 24 divisors (see below), whose sum is σ = 34878720. Its totient is φ = 11138400.

The previous prime is 20990143. The next prime is 20990183. The reversal of 20990175 is 57109902.

It is not a de Polignac number, because 20990175 - 2⁵ = 20990143 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 17340 + ... + 18510.

It is an arithmetic number, because the mean of its divisors is an integer number (1453280).

Almost surely, 2^20990175 is an apocalyptic number.

20990175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20990175 is a deficient number, since it is larger than the sum of its proper divisors (13888545).

20990175 is a wasteful number, since it uses less digits than its factorization.

20990175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423 (or 1418 counting only the distinct ones).

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

The square root of 20990175 is about 4581.5035741555. The cubic root of 20990175 is about 275.8493848469.

The spelling of 20990175 in words is "twenty million, nine hundred ninety thousand, one hundred seventy-five".