20354137 has 4 divisors (see below), whose sum is σ = 20438836. Its totient is φ = 20269440.

The previous prime is 20354129. The next prime is 20354153. The reversal of 20354137 is 73145302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14258176 + 6095961 = 3776^2 + 2469^2 .

It is a cyclic number.

It is not a de Polignac number, because 20354137 - 2³ = 20354129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20358137) 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, 41988 + ... + 42469.

It is an arithmetic number, because the mean of its divisors is an integer number (5109709).

Almost surely, 2^20354137 is an apocalyptic number.

It is an amenable number.

20354137 is a deficient number, since it is larger than the sum of its proper divisors (84699).

20354137 is an equidigital number, since it uses as much as digits as its factorization.

20354137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84698.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20354137 is about 4511.5559400278. Note that the first 3 decimals coincide. The cubic root of 20354137 is about 273.0345235806.

Adding to 20354137 its reverse (73145302), we get a palindrome (93499439).

The spelling of 20354137 in words is "twenty million, three hundred fifty-four thousand, one hundred thirty-seven".