19621442780 has 24 divisors (see below), whose sum is σ = 41221365360. Its totient is φ = 7845465600.

The previous prime is 19621442773. The next prime is 19621442791. The reversal of 19621442780 is 8724412691.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142421 + ... + 243980.

It is an arithmetic number, because the mean of its divisors is an integer number (1717556890).

Almost surely, 2^19621442780 is an apocalyptic number.

19621442780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19621442780 is an abundant number, since it is smaller than the sum of its proper divisors (21599922580).

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

19621442780 is a wasteful number, since it uses less digits than its factorization.

19621442780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388949 (or 388947 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 19621442780 in words is "nineteen billion, six hundred twenty-one million, four hundred forty-two thousand, seven hundred eighty".