20157306 has 48 divisors (see below), whose sum is σ = 44306496. Its totient is φ = 6110208.

The previous prime is 20157301. The next prime is 20157311. The reversal of 20157306 is 60375102.

It is an interprime number because it is at equal distance from previous prime (20157301) and next prime (20157311).

It is not an unprimeable number, because it can be changed into a prime (20157301) 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, 104346 + ... + 104538.

It is an arithmetic number, because the mean of its divisors is an integer number (923052).

Almost surely, 2^20157306 is an apocalyptic number.

20157306 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20157306, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22153248).

20157306 is an abundant number, since it is smaller than the sum of its proper divisors (24149190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20157306 is a wasteful number, since it uses less digits than its factorization.

20157306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 20157306 is about 4489.6888533617. The cubic root of 20157306 is about 272.1515609340.

The spelling of 20157306 in words is "twenty million, one hundred fifty-seven thousand, three hundred six".