20147525 has 6 divisors (see below), whose sum is σ = 24982962. Its totient is φ = 16118000.

The previous prime is 20147509. The next prime is 20147539. The reversal of 20147525 is 52574102.

It can be written as a sum of positive squares in 3 ways, for example, as 3247204 + 16900321 = 1802^2 + 4111^2 .

It is not a de Polignac number, because 20147525 - 2⁴ = 20147509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20147494 and 20147503.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 402926 + ... + 402975.

It is an arithmetic number, because the mean of its divisors is an integer number (4163827).

Almost surely, 2^20147525 is an apocalyptic number.

20147525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20147525 is a deficient number, since it is larger than the sum of its proper divisors (4835437).

20147525 is an equidigital number, since it uses as much as digits as its factorization.

20147525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805911 (or 805906 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 20147525 is about 4488.5994474892. The cubic root of 20147525 is about 272.1075347947.

The spelling of 20147525 in words is "twenty million, one hundred forty-seven thousand, five hundred twenty-five".