20142155 has 8 divisors (see below), whose sum is σ = 26367984. Its totient is φ = 14648800.

The previous prime is 20142131. The next prime is 20142163. The reversal of 20142155 is 55124102.

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

It is not a de Polignac number, because 20142155 - 2⁶ = 20142091 is a prime.

It is a Duffinian number.

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, 183056 + ... + 183165.

It is an arithmetic number, because the mean of its divisors is an integer number (3295998).

Almost surely, 2^20142155 is an apocalyptic number.

20142155 is a deficient number, since it is larger than the sum of its proper divisors (6225829).

20142155 is a wasteful number, since it uses less digits than its factorization.

20142155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366237.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 20142155 is about 4488.0012254900. The cubic root of 20142155 is about 272.0833573452.

Adding to 20142155 its reverse (55124102), we get a palindrome (75266257).

The spelling of 20142155 in words is "twenty million, one hundred forty-two thousand, one hundred fifty-five".