20194728465731 has 4 divisors (see below), whose sum is σ = 20194742299992. Its totient is φ = 20194714631472.

The previous prime is 20194728465719. The next prime is 20194728465917. The reversal of 20194728465731 is 13756482749102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20194728465731 - 2¹⁴ = 20194728449347 is a prime.

It is a super-2 number, since 2×20194728465731² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20194728465931) 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, 4429205 + ... + 7746438.

It is an arithmetic number, because the mean of its divisors is an integer number (5048685574998).

It is a 1-persistent number, because it is pandigital, but 2⋅20194728465731 = 40389456931462 is not.

Almost surely, 2^{20194728465731} is an apocalyptic number.

20194728465731 is a deficient number, since it is larger than the sum of its proper divisors (13834261).

20194728465731 is a wasteful number, since it uses less digits than its factorization.

20194728465731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13834260.

The product of its (nonzero) digits is 20321280, while the sum is 59.

The spelling of 20194728465731 in words is "twenty trillion, one hundred ninety-four billion, seven hundred twenty-eight million, four hundred sixty-five thousand, seven hundred thirty-one".