20187380 has 12 divisors (see below), whose sum is σ = 42393540. Its totient is φ = 8074944.

The previous prime is 20187373. The next prime is 20187383. The reversal of 20187380 is 8378102.

It can be written as a sum of positive squares in 2 ways, for example, as 10214416 + 9972964 = 3196^2 + 3158^2 .

It is a super-2 number, since 2×20187380² = 815060622528800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20187383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504665 + ... + 504704.

It is an arithmetic number, because the mean of its divisors is an integer number (3532795).

Almost surely, 2^20187380 is an apocalyptic number.

20187380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20187380 is an abundant number, since it is smaller than the sum of its proper divisors (22206160).

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

20187380 is a wasteful number, since it uses less digits than its factorization.

20187380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009378 (or 1009376 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 20187380 is about 4493.0368349258. The cubic root of 20187380 is about 272.2868405689.

The spelling of 20187380 in words is "twenty million, one hundred eighty-seven thousand, three hundred eighty".