20342155 has 8 divisors (see below), whose sum is σ = 24437952. Its totient is φ = 16255488.

The previous prime is 20342131. The next prime is 20342167. The reversal of 20342155 is 55124302.

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

It is a cyclic number.

It is not a de Polignac number, because 20342155 - 2⁵ = 20342123 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 4414 + ... + 7756.

It is an arithmetic number, because the mean of its divisors is an integer number (3054744).

Almost surely, 2^20342155 is an apocalyptic number.

20342155 is a deficient number, since it is larger than the sum of its proper divisors (4095797).

20342155 is a wasteful number, since it uses less digits than its factorization.

20342155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4565.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20342155 is about 4510.2278212968. The cubic root of 20342155 is about 272.9809367377.

Adding to 20342155 its reverse (55124302), we get a palindrome (75466457).

The spelling of 20342155 in words is "twenty million, three hundred forty-two thousand, one hundred fifty-five".