20158680 has 64 divisors (see below), whose sum is σ = 62438400. Its totient is φ = 5201280.

The previous prime is 20158661. The next prime is 20158681. The reversal of 20158680 is 8685102.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20158681) 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, 1011 + ... + 6429.

It is an arithmetic number, because the mean of its divisors is an integer number (975600).

Almost surely, 2^20158680 is an apocalyptic number.

20158680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20158680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31219200).

20158680 is an abundant number, since it is smaller than the sum of its proper divisors (42279720).

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

20158680 is a wasteful number, since it uses less digits than its factorization.

20158680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5464 (or 5460 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 20158680 is about 4489.8418680395. The cubic root of 20158680 is about 272.1577444281.

The spelling of 20158680 in words is "twenty million, one hundred fifty-eight thousand, six hundred eighty".