19840680 has 64 divisors (see below), whose sum is σ = 66139200. Its totient is φ = 5290560.

The previous prime is 19840663. The next prime is 19840687. The reversal of 19840680 is 8604891.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (19840687) 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, 8106 + ... + 10265.

It is an arithmetic number, because the mean of its divisors is an integer number (1033425).

Almost surely, 2^19840680 is an apocalyptic number.

19840680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19840680 is an abundant number, since it is smaller than the sum of its proper divisors (46298520).

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

19840680 is a wasteful number, since it uses less digits than its factorization.

19840680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18391 (or 18381 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 19840680 is about 4454.2878218633. The cubic root of 19840680 is about 270.7190709062.

The spelling of 19840680 in words is "nineteen million, eight hundred forty thousand, six hundred eighty".