20786157 has 24 divisors (see below), whose sum is σ = 35116224. Its totient is φ = 11600064.

The previous prime is 20786153. The next prime is 20786159. The reversal of 20786157 is 75168702.

It is not a de Polignac number, because 20786157 - 2² = 20786153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20786153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1128 + ... + 6545.

It is an arithmetic number, because the mean of its divisors is an integer number (1463176).

Almost surely, 2^20786157 is an apocalyptic number.

It is an amenable number.

20786157 is a deficient number, since it is larger than the sum of its proper divisors (14330067).

20786157 is a wasteful number, since it uses less digits than its factorization.

20786157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7729 (or 7726 counting only the distinct ones).

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

The square root of 20786157 is about 4559.1838085342. The cubic root of 20786157 is about 274.9527500088.

The spelling of 20786157 in words is "twenty million, seven hundred eighty-six thousand, one hundred fifty-seven".