19804573436 has 48 divisors (see below), whose sum is σ = 37211166720. Its totient is φ = 9189922560.

The previous prime is 19804573409. The next prime is 19804573463. The reversal of 19804573436 is 63437540891.

It is an interprime number because it is at equal distance from previous prime (19804573409) and next prime (19804573463).

It is a super-2 number, since 2×19804573436² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1668041 + ... + 1679871.

It is an arithmetic number, because the mean of its divisors is an integer number (775232640).

Almost surely, 2^19804573436 is an apocalyptic number.

It is an amenable number.

19804573436 is a deficient number, since it is larger than the sum of its proper divisors (17406593284).

19804573436 is a wasteful number, since it uses less digits than its factorization.

19804573436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12194 (or 12192 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 19804573436 in words is "nineteen billion, eight hundred four million, five hundred seventy-three thousand, four hundred thirty-six".