19420577243 has 4 divisors (see below), whose sum is σ = 19612860288. Its totient is φ = 19228294200.

The previous prime is 19420577203. The next prime is 19420577251. The reversal of 19420577243 is 34277502491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34277502491 = 153913 ⋅222707.

It is a cyclic number.

It is not a de Polignac number, because 19420577243 - 2¹⁸ = 19420315099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19420577194 and 19420577203.

It is not an unprimeable number, because it can be changed into a prime (19420577203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96141371 + ... + 96141572.

It is an arithmetic number, because the mean of its divisors is an integer number (4903215072).

Almost surely, 2^19420577243 is an apocalyptic number.

19420577243 is a deficient number, since it is larger than the sum of its proper divisors (192283045).

19420577243 is a wasteful number, since it uses less digits than its factorization.

19420577243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192283044.

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 19420577243 in words is "nineteen billion, four hundred twenty million, five hundred seventy-seven thousand, two hundred forty-three".