20687380 has 48 divisors (see below), whose sum is σ = 50150016. Its totient is φ = 7021440.

The previous prime is 20687377. The next prime is 20687383. The reversal of 20687380 is 8378602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20687377) and next prime (20687383).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20687383) 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, 14290 + ... + 15670.

It is an arithmetic number, because the mean of its divisors is an integer number (1044792).

Almost surely, 2^20687380 is an apocalyptic number.

20687380 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 20687380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25075008).

20687380 is an abundant number, since it is smaller than the sum of its proper divisors (29462636).

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

20687380 is a wasteful number, since it uses less digits than its factorization.

20687380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504 (or 1502 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20687380 is about 4548.3381580529. The cubic root of 20687380 is about 274.5165279259.

The spelling of 20687380 in words is "twenty million, six hundred eighty-seven thousand, three hundred eighty".