20787340 has 48 divisors (see below), whose sum is σ = 51250752. Its totient is φ = 6932736.

The previous prime is 20787337. The next prime is 20787373. The reversal of 20787340 is 4378702.

It is a super-2 number, since 2×20787340² = 864227008551200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3174 + ... + 7186.

It is an arithmetic number, because the mean of its divisors is an integer number (1067724).

Almost surely, 2^20787340 is an apocalyptic number.

20787340 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 20787340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25625376).

20787340 is an abundant number, since it is smaller than the sum of its proper divisors (30463412).

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

20787340 is a wasteful number, since it uses less digits than its factorization.

20787340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4066 (or 4064 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 20787340 is about 4559.3135448223. The cubic root of 20787340 is about 274.9579660272.

The spelling of 20787340 in words is "twenty million, seven hundred eighty-seven thousand, three hundred forty".