20125579 has 8 divisors (see below), whose sum is σ = 21330000. Its totient is φ = 18935712.

The previous prime is 20125543. The next prime is 20125583. The reversal of 20125579 is 97552102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20125579 - 2⁷ = 20125451 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20125579.

It is not an unprimeable number, because it can be changed into a prime (20125519) 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 7 ways as a sum of consecutive naturals, for example, 724 + ... + 6385.

It is an arithmetic number, because the mean of its divisors is an integer number (2666250).

Almost surely, 2^20125579 is an apocalyptic number.

20125579 is a deficient number, since it is larger than the sum of its proper divisors (1204421).

20125579 is a wasteful number, since it uses less digits than its factorization.

20125579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7277.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 20125579 is about 4486.1541435845. The cubic root of 20125579 is about 272.0086998010.

The spelling of 20125579 in words is "twenty million, one hundred twenty-five thousand, five hundred seventy-nine".