20147550 has 48 divisors (see below), whose sum is σ = 52911792. Its totient is φ = 5056000.

The previous prime is 20147549. The next prime is 20147587. The reversal of 20147550 is 5574102.

It is a self number, because there is not a number n which added to its sum of digits gives 20147550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1401 + ... + 6500.

It is an arithmetic number, because the mean of its divisors is an integer number (1102329).

Almost surely, 2^20147550 is an apocalyptic number.

20147550 is an abundant number, since it is smaller than the sum of its proper divisors (32764242).

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

20147550 is a wasteful number, since it uses less digits than its factorization.

20147550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7933 (or 7928 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 20147550 is about 4488.6022323213. The cubic root of 20147550 is about 272.1076473426.

The spelling of 20147550 in words is "twenty million, one hundred forty-seven thousand, five hundred fifty".