20193257 has 24 divisors (see below), whose sum is σ = 24944832. Its totient is φ = 16005600.

The previous prime is 20193247. The next prime is 20193293. The reversal of 20193257 is 75239102.

It is not a de Polignac number, because 20193257 - 2⁸ = 20193001 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20193247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154082 + ... + 154212.

It is an arithmetic number, because the mean of its divisors is an integer number (1039368).

Almost surely, 2^20193257 is an apocalyptic number.

It is an amenable number.

20193257 is a deficient number, since it is larger than the sum of its proper divisors (4751575).

20193257 is a wasteful number, since it uses less digits than its factorization.

20193257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 20193257 is about 4493.6907993319. The cubic root of 20193257 is about 272.3132609447.

The spelling of 20193257 in words is "twenty million, one hundred ninety-three thousand, two hundred fifty-seven".