20147725 has 24 divisors (see below), whose sum is σ = 27498240. Its totient is φ = 14550720.

The previous prime is 20147723. The next prime is 20147761. The reversal of 20147725 is 52774102.

It is not a de Polignac number, because 20147725 - 2¹ = 20147723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20147693 and 20147702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20147723) 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 23 ways as a sum of consecutive naturals, for example, 14616 + ... + 15934.

It is an arithmetic number, because the mean of its divisors is an integer number (1145760).

Almost surely, 2^20147725 is an apocalyptic number.

20147725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20147725 is a deficient number, since it is larger than the sum of its proper divisors (7350515).

20147725 is a wasteful number, since it uses less digits than its factorization.

20147725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389 (or 1384 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 20147725 is about 4488.6217260981. The cubic root of 20147725 is about 272.1084351754.

The spelling of 20147725 in words is "twenty million, one hundred forty-seven thousand, seven hundred twenty-five".