20147955 has 8 divisors (see below), whose sum is σ = 32236752. Its totient is φ = 10745568.

The previous prime is 20147947. The next prime is 20148041. The reversal of 20147955 is 55974102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20147955 - 2³ = 20147947 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 671584 + ... + 671613.

It is an arithmetic number, because the mean of its divisors is an integer number (4029594).

Almost surely, 2^20147955 is an apocalyptic number.

20147955 is a deficient number, since it is larger than the sum of its proper divisors (12088797).

20147955 is a wasteful number, since it uses less digits than its factorization.

20147955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343205.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 20147955 is about 4488.6473463617. The cubic root of 20147955 is about 272.1094706058.

The spelling of 20147955 in words is "twenty million, one hundred forty-seven thousand, nine hundred fifty-five".