20293257 has 8 divisors (see below), whose sum is σ = 28649376. Its totient is φ = 12732992.

The previous prime is 20293241. The next prime is 20293289. The reversal of 20293257 is 75239202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20293257 - 2⁴ = 20293241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20293657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198903 + ... + 199004.

It is an arithmetic number, because the mean of its divisors is an integer number (3581172).

Almost surely, 2^20293257 is an apocalyptic number.

It is an amenable number.

20293257 is a deficient number, since it is larger than the sum of its proper divisors (8356119).

20293257 is a wasteful number, since it uses less digits than its factorization.

20293257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397927.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20293257 is about 4504.8037693112. The cubic root of 20293257 is about 272.7620328321.

The spelling of 20293257 in words is "twenty million, two hundred ninety-three thousand, two hundred fifty-seven".