20037397 has 4 divisors (see below), whose sum is σ = 20526156. Its totient is φ = 19548640.

The previous prime is 20037359. The next prime is 20037401. The reversal of 20037397 is 79373002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79373002 = 2 ⋅39686501.

It can be written as a sum of positive squares in 2 ways, for example, as 9186961 + 10850436 = 3031^2 + 3294^2 .

It is a cyclic number.

It is not a de Polignac number, because 20037397 - 2²³ = 11648789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20037307) 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, 244318 + ... + 244399.

It is an arithmetic number, because the mean of its divisors is an integer number (5131539).

Almost surely, 2^20037397 is an apocalyptic number.

It is an amenable number.

20037397 is a deficient number, since it is larger than the sum of its proper divisors (488759).

20037397 is an equidigital number, since it uses as much as digits as its factorization.

20037397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488758.

The product of its (nonzero) digits is 7938, while the sum is 31.

The square root of 20037397 is about 4476.3151140196. The cubic root of 20037397 is about 271.6108414446.

The spelling of 20037397 in words is "twenty million, thirty-seven thousand, three hundred ninety-seven".