20057157 has 6 divisors (see below), whose sum is σ = 28971462. Its totient is φ = 13371432.

The previous prime is 20057143. The next prime is 20057171. The reversal of 20057157 is 75175002.

It is an interprime number because it is at equal distance from previous prime (20057143) and next prime (20057171).

It can be written as a sum of positive squares in only one way, i.e., 12489156 + 7568001 = 3534^2 + 2751^2 .

It is not a de Polignac number, because 20057157 - 2⁷ = 20057029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20057157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20057117) 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, 1114278 + ... + 1114295.

It is an arithmetic number, because the mean of its divisors is an integer number (4828577).

Almost surely, 2^20057157 is an apocalyptic number.

It is an amenable number.

20057157 is a deficient number, since it is larger than the sum of its proper divisors (8914305).

20057157 is a wasteful number, since it uses less digits than its factorization.

20057157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228579 (or 2228576 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 20057157 is about 4478.5217427182. The cubic root of 20057157 is about 271.7000956685.

The spelling of 20057157 in words is "twenty million, fifty-seven thousand, one hundred fifty-seven".