20867157 has 6 divisors (see below), whose sum is σ = 30141462. Its totient is φ = 13911432.

The previous prime is 20867131. The next prime is 20867173. The reversal of 20867157 is 75176802.

It can be written as a sum of positive squares in only one way, i.e., 20439441 + 427716 = 4521^2 + 654^2 .

It is not a de Polignac number, because 20867157 - 2¹¹ = 20865109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20867117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1159278 + ... + 1159295.

It is an arithmetic number, because the mean of its divisors is an integer number (5023577).

Almost surely, 2^20867157 is an apocalyptic number.

It is an amenable number.

20867157 is a deficient number, since it is larger than the sum of its proper divisors (9274305).

20867157 is a wasteful number, since it uses less digits than its factorization.

20867157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2318579 (or 2318576 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 20867157 is about 4568.0583402579. The cubic root of 20867157 is about 275.3094346085.

The spelling of 20867157 in words is "twenty million, eight hundred sixty-seven thousand, one hundred fifty-seven".