19408920340 has 24 divisors (see below), whose sum is σ = 40772281032. Its totient is φ = 7760987520.

The previous prime is 19408920329. The next prime is 19408920359. The reversal of 19408920340 is 4302980491.

It can be written as a sum of positive squares in 4 ways, for example, as 3523847044 + 15885073296 = 59362^2 + 126036^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19408920293 and 19408920302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99031 + ... + 220510.

It is an arithmetic number, because the mean of its divisors is an integer number (1698845043).

Almost surely, 2^19408920340 is an apocalyptic number.

19408920340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19408920340 is an abundant number, since it is smaller than the sum of its proper divisors (21363360692).

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

19408920340 is a wasteful number, since it uses less digits than its factorization.

19408920340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322587 (or 322585 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 19408920340 in words is "nineteen billion, four hundred eight million, nine hundred twenty thousand, three hundred forty".