20597157 has 12 divisors (see below), whose sum is σ = 34001760. Its totient is φ = 11769768.

The previous prime is 20597147. The next prime is 20597177. The reversal of 20597157 is 75179502.

It is not a de Polignac number, because 20597157 - 2¹⁴ = 20580773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20597107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163407 + ... + 163532.

It is an arithmetic number, because the mean of its divisors is an integer number (2833480).

Almost surely, 2^20597157 is an apocalyptic number.

It is an amenable number.

20597157 is a deficient number, since it is larger than the sum of its proper divisors (13404603).

20597157 is a wasteful number, since it uses less digits than its factorization.

20597157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326952 (or 326949 counting only the distinct ones).

The product of its (nonzero) digits is 22050, while the sum is 36.

The square root of 20597157 is about 4538.4090824869. The cubic root of 20597157 is about 274.1168672260.

It can be divided in two parts, 2059 and 7157, that added together give a square (9216 = 96²).

The spelling of 20597157 in words is "twenty million, five hundred ninety-seven thousand, one hundred fifty-seven".