19996780 has 24 divisors (see below), whose sum is σ = 42153552. Its totient is φ = 7968192.

The previous prime is 19996771. The next prime is 19996783. The reversal of 19996780 is 8769991.

It is not an unprimeable number, because it can be changed into a prime (19996783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3894 + ... + 7426.

It is an arithmetic number, because the mean of its divisors is an integer number (1756398).

Almost surely, 2^19996780 is an apocalyptic number.

19996780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19996780 is an abundant number, since it is smaller than the sum of its proper divisors (22156772).

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

19996780 is a wasteful number, since it uses less digits than its factorization.

19996780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3825 (or 3823 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 19996780 is about 4471.7759335638. The cubic root of 19996780 is about 271.4271935031.

The spelling of 19996780 in words is "nineteen million, nine hundred ninety-six thousand, seven hundred eighty".