20147508 has 24 divisors (see below), whose sum is σ = 52234560. Its totient is φ = 6715800.

The previous prime is 20147483. The next prime is 20147509. The reversal of 20147508 is 80574102.

It is a super-2 number, since 2×20147508² = 811844157220128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20147509) 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, 93168 + ... + 93383.

It is an arithmetic number, because the mean of its divisors is an integer number (2176440).

Almost surely, 2^20147508 is an apocalyptic number.

It is an amenable number.

20147508 is an abundant number, since it is smaller than the sum of its proper divisors (32087052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20147508 is a wasteful number, since it uses less digits than its factorization.

20147508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186564 (or 186556 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20147508 is about 4488.5975538023. The cubic root of 20147508 is about 272.1074582621.

The spelling of 20147508 in words is "twenty million, one hundred forty-seven thousand, five hundred eight".