20343157 has 6 divisors (see below), whose sum is σ = 20492214. Its totient is φ = 20194920.

The previous prime is 20343139. The next prime is 20343179. The reversal of 20343157 is 75134302.

It can be written as a sum of positive squares in only one way, i.e., 14394436 + 5948721 = 3794^2 + 2439^2 .

It is not a de Polignac number, because 20343157 - 2¹¹ = 20341109 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 (20343137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73303 + ... + 73579.

It is an arithmetic number, because the mean of its divisors is an integer number (3415369).

Almost surely, 2^20343157 is an apocalyptic number.

It is an amenable number.

20343157 is a deficient number, since it is larger than the sum of its proper divisors (149057).

20343157 is an frugal number, since it uses more digits than its factorization.

20343157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20343157 is about 4510.3389007923. The cubic root of 20343157 is about 272.9854187671.

Adding to 20343157 its reverse (75134302), we get a palindrome (95477459).

The spelling of 20343157 in words is "twenty million, three hundred forty-three thousand, one hundred fifty-seven".