20287357 has 16 divisors (see below), whose sum is σ = 22036608. Its totient is φ = 18627840.

The previous prime is 20287343. The next prime is 20287363. The reversal of 20287357 is 75378202.

It is a cyclic number.

It is not a de Polignac number, because 20287357 - 2²³ = 11898749 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 (20287367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72057 + ... + 72337.

It is an arithmetic number, because the mean of its divisors is an integer number (1377288).

Almost surely, 2^20287357 is an apocalyptic number.

It is an amenable number.

20287357 is a deficient number, since it is larger than the sum of its proper divisors (1749251).

20287357 is a wasteful number, since it uses less digits than its factorization.

20287357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420.

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

The square root of 20287357 is about 4504.1488652130. The cubic root of 20287357 is about 272.7355962679.

The spelling of 20287357 in words is "twenty million, two hundred eighty-seven thousand, three hundred fifty-seven".