20342137 has 4 divisors (see below), whose sum is σ = 21043620. Its totient is φ = 19640656.

The previous prime is 20342131. The next prime is 20342167. The reversal of 20342137 is 73124302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73124302 = 2 ⋅36562151.

It can be written as a sum of positive squares in 2 ways, for example, as 12524521 + 7817616 = 3539^2 + 2796^2 .

It is not a de Polignac number, because 20342137 - 2³ = 20342129 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 350698 + ... + 350755.

It is an arithmetic number, because the mean of its divisors is an integer number (5260905).

Almost surely, 2^20342137 is an apocalyptic number.

It is an amenable number.

20342137 is a deficient number, since it is larger than the sum of its proper divisors (701483).

20342137 is an equidigital number, since it uses as much as digits as its factorization.

20342137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701482.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20342137 is about 4510.2258258318. The cubic root of 20342137 is about 272.9808562209.

Adding to 20342137 its reverse (73124302), we get a palindrome (93466439).

The spelling of 20342137 in words is "twenty million, three hundred forty-two thousand, one hundred thirty-seven".