19612214820 has 216 divisors, whose sum is σ = 67160321592. Its totient is φ = 4625786880.

The previous prime is 19612214819. The next prime is 19612214833. The reversal of 19612214820 is 2841221691.

19612214820 is a `hidden beast` number, since 1 + 9 + 612 + 2 + 14 + 8 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12707601984 + 6904612836 = 112728^2 + 83094^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 793692 + ... + 818028.

Almost surely, 2^19612214820 is an apocalyptic number.

19612214820 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 19612214820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33580160796).

19612214820 is an abundant number, since it is smaller than the sum of its proper divisors (47548106772).

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

19612214820 is a wasteful number, since it uses less digits than its factorization.

19612214820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24411 (or 24395 counting only the distinct ones).

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

It can be divided in two parts, 19612 and 214820, that added together give a palindrome (234432).

The spelling of 19612214820 in words is "nineteen billion, six hundred twelve million, two hundred fourteen thousand, eight hundred twenty".