20147556 has 96 divisors (see below), whose sum is σ = 56448000. Its totient is φ = 5512320.

The previous prime is 20147549. The next prime is 20147587. The reversal of 20147556 is 65574102.

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 31 ways as a sum of consecutive naturals, for example, 101145 + ... + 101343.

It is an arithmetic number, because the mean of its divisors is an integer number (588000).

Almost surely, 2^20147556 is an apocalyptic number.

20147556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20147556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28224000).

20147556 is an abundant number, since it is smaller than the sum of its proper divisors (36300444).

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

20147556 is a wasteful number, since it uses less digits than its factorization.

20147556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 20147556 is about 4488.6029006808. The cubic root of 20147556 is about 272.1076743541.

The spelling of 20147556 in words is "twenty million, one hundred forty-seven thousand, five hundred fifty-six".