20373257 has 4 divisors (see below), whose sum is σ = 20602260. Its totient is φ = 20144256.

The previous prime is 20373247. The next prime is 20373289. The reversal of 20373257 is 75237302.

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 11723776 + 8649481 = 3424^2 + 2941^2 .

It is a cyclic number.

It is not a de Polignac number, because 20373257 - 2¹⁴ = 20356873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20373247) 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, 114368 + ... + 114545.

It is an arithmetic number, because the mean of its divisors is an integer number (5150565).

Almost surely, 2^20373257 is an apocalyptic number.

It is an amenable number.

20373257 is a deficient number, since it is larger than the sum of its proper divisors (229003).

20373257 is an equidigital number, since it uses as much as digits as its factorization.

20373257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229002.

The product of its (nonzero) digits is 8820, while the sum is 29.

The square root of 20373257 is about 4513.6744455045. The cubic root of 20373257 is about 273.1199900112.

The spelling of 20373257 in words is "twenty million, three hundred seventy-three thousand, two hundred fifty-seven".