20147530 has 16 divisors (see below), whose sum is σ = 39055464. Its totient is φ = 7439040.

The previous prime is 20147509. The next prime is 20147539. The reversal of 20147530 is 3574102.

It can be written as a sum of positive squares in 4 ways, for example, as 12895281 + 7252249 = 3591^2 + 2693^2 .

It is not an unprimeable number, because it can be changed into a prime (20147539) 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, 77361 + ... + 77620.

Almost surely, 2^20147530 is an apocalyptic number.

20147530 is a deficient number, since it is larger than the sum of its proper divisors (18907934).

20147530 is a wasteful number, since it uses less digits than its factorization.

20147530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155001.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20147530 is about 4488.6000044557. The cubic root of 20147530 is about 272.1075573043.

The spelling of 20147530 in words is "twenty million, one hundred forty-seven thousand, five hundred thirty".