20667157 has 16 divisors (see below), whose sum is σ = 24458112. Its totient is φ = 17095680.

The previous prime is 20667151. The next prime is 20667187. The reversal of 20667157 is 75176602.

It is not a de Polignac number, because 20667157 - 2⁷ = 20667029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20667151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30373 + ... + 31045.

It is an arithmetic number, because the mean of its divisors is an integer number (1528632).

Almost surely, 2^20667157 is an apocalyptic number.

It is an amenable number.

20667157 is a deficient number, since it is larger than the sum of its proper divisors (3790955).

20667157 is a wasteful number, since it uses less digits than its factorization.

20667157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20667157 is about 4546.1144948186. The cubic root of 20667157 is about 274.4270473230.

The spelling of 20667157 in words is "twenty million, six hundred sixty-seven thousand, one hundred fifty-seven".