19620726480 has 60 divisors (see below), whose sum is σ = 65892942180. Its totient is φ = 5232193536.

The previous prime is 19620726473. The next prime is 19620726481. The reversal of 19620726480 is 8462702691.

It is a happy number.

19620726480 is a `hidden beast` number, since 19 + 620 + 7 + 2 + 6 + 4 + 8 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13585301136 + 6035425344 = 116556^2 + 77688^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19620726481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13624785 + ... + 13626224.

It is an arithmetic number, because the mean of its divisors is an integer number (1098215703).

Almost surely, 2^19620726480 is an apocalyptic number.

19620726480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19620726480 is an abundant number, since it is smaller than the sum of its proper divisors (46272215700).

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

19620726480 is a wasteful number, since it uses less digits than its factorization.

19620726480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27251028 (or 27251019 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 19620726480 in words is "nineteen billion, six hundred twenty million, seven hundred twenty-six thousand, four hundred eighty".