20273857 has 4 divisors (see below), whose sum is σ = 20286916. Its totient is φ = 20260800.

The previous prime is 20273821. The next prime is 20273863. The reversal of 20273857 is 75837202.

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 9834496 + 10439361 = 3136^2 + 3231^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20273857 is a prime.

It is a super-2 number, since 2×20273857² = 822058555312898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20273887) 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, 3828 + ... + 7429.

It is an arithmetic number, because the mean of its divisors is an integer number (5071729).

Almost surely, 2^20273857 is an apocalyptic number.

It is an amenable number.

20273857 is a deficient number, since it is larger than the sum of its proper divisors (13059).

20273857 is a wasteful number, since it uses less digits than its factorization.

20273857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13058.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 20273857 is about 4502.6499975015. The cubic root of 20273857 is about 272.6750865367.

The spelling of 20273857 in words is "twenty million, two hundred seventy-three thousand, eight hundred fifty-seven".