19902487456 has 24 divisors (see below), whose sum is σ = 39209970240. Its totient is φ = 9944399808.

The previous prime is 19902487439. The next prime is 19902487477. The reversal of 19902487456 is 65478420991.

It is a super-2 number, since 2×19902487456² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19902487397 and 19902487406.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166456 + ... + 259831.

It is an arithmetic number, because the mean of its divisors is an integer number (1633748760).

Almost surely, 2^19902487456 is an apocalyptic number.

19902487456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19902487456 is a deficient number, since it is larger than the sum of its proper divisors (19307482784).

19902487456 is a wasteful number, since it uses less digits than its factorization.

19902487456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427756 (or 427748 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 19902487456 in words is "nineteen billion, nine hundred two million, four hundred eighty-seven thousand, four hundred fifty-six".