20149975 has 24 divisors (see below), whose sum is σ = 26784000. Its totient is φ = 14991840.

The previous prime is 20149973. The next prime is 20150021. The reversal of 20149975 is 57994102.

It is not a de Polignac number, because 20149975 - 2¹ = 20149973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20149973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27666 + ... + 28384.

It is an arithmetic number, because the mean of its divisors is an integer number (1116000).

Almost surely, 2^20149975 is an apocalyptic number.

20149975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20149975 is a deficient number, since it is larger than the sum of its proper divisors (6634025).

20149975 is a wasteful number, since it uses less digits than its factorization.

20149975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 20149975 is about 4488.8723528298. The cubic root of 20149975 is about 272.1185640475.

It can be divided in two parts, 201 and 49975, that added together give a square (50176 = 224²).

The spelling of 20149975 in words is "twenty million, one hundred forty-nine thousand, nine hundred seventy-five".