19748921040 has 120 divisors (see below), whose sum is σ = 68779951968. Its totient is φ = 5266373760.

The previous prime is 19748920993. The next prime is 19748921053. The reversal of 19748921040 is 4012984791.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 488506 + ... + 527385.

Almost surely, 2^19748921040 is an apocalyptic number.

19748921040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19748921040 is an abundant number, since it is smaller than the sum of its proper divisors (49031030928).

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

19748921040 is a wasteful number, since it uses less digits than its factorization.

19748921040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015919 (or 1015901 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 19748921040 in words is "nineteen billion, seven hundred forty-eight million, nine hundred twenty-one thousand, forty".