19487431020 has 48 divisors (see below), whose sum is σ = 56446356960. Its totient is φ = 5017453056.

The previous prime is 19487430979. The next prime is 19487431027. The reversal of 19487431020 is 2013478491.

It is a self number, because there is not a number n which added to its sum of digits gives 19487431020.

It is not an unprimeable number, because it can be changed into a prime (19487431027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5598097 + ... + 5601576.

It is an arithmetic number, because the mean of its divisors is an integer number (1175965770).

Almost surely, 2^19487431020 is an apocalyptic number.

19487431020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19487431020 is an abundant number, since it is smaller than the sum of its proper divisors (36958925940).

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

19487431020 is a wasteful number, since it uses less digits than its factorization.

19487431020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11199714 (or 11199712 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 19487431020 in words is "nineteen billion, four hundred eighty-seven million, four hundred thirty-one thousand, twenty".