19779064620 has 144 divisors (see below), whose sum is σ = 64645928928. Its totient is φ = 4505303040.

The previous prime is 19779064583. The next prime is 19779064693. The reversal of 19779064620 is 2646097791.

It is a super-2 number, since 2×19779064620² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

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 47 ways as a sum of consecutive naturals, for example, 849940 + ... + 872900.

It is an arithmetic number, because the mean of its divisors is an integer number (448930062).

Almost surely, 2^19779064620 is an apocalyptic number.

19779064620 is a gapful number since it is divisible by the number (10) 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 19779064620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32322964464).

19779064620 is an abundant number, since it is smaller than the sum of its proper divisors (44866864308).

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

19779064620 is a wasteful number, since it uses less digits than its factorization.

19779064620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23280 (or 23271 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 51.

The spelling of 19779064620 in words is "nineteen billion, seven hundred seventy-nine million, sixty-four thousand, six hundred twenty".