20342138 has 32 divisors (see below), whose sum is σ = 32901120. Its totient is φ = 9416880.

The previous prime is 20342131. The next prime is 20342167. The reversal of 20342138 is 83124302.

It is a super-3 number, since 3×20342138³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (20342131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245045 + ... + 245127.

It is an arithmetic number, because the mean of its divisors is an integer number (1028160).

Almost surely, 2^20342138 is an apocalyptic number.

20342138 is a deficient number, since it is larger than the sum of its proper divisors (12558982).

20342138 is a wasteful number, since it uses less digits than its factorization.

20342138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20342138 is about 4510.2259366910. The cubic root of 20342138 is about 272.9808606940.

The spelling of 20342138 in words is "twenty million, three hundred forty-two thousand, one hundred thirty-eight".