20920358191019 has 10 divisors (see below), whose sum is σ = 24405632361420. Its totient is φ = 17931735590244.

The previous prime is 20920358190971. The next prime is 20920358191021. The reversal of 20920358191019 is 91019185302902.

It is a de Polignac number, because none of the positive numbers 2^k-20920358191019 is a prime.

It is a super-2 number, since 2×20920358191019² (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 (20920358194019) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4356590309 + ... + 4356595110.

It is an arithmetic number, because the mean of its divisors is an integer number (2440563236142).

Almost surely, 2^{20920358191019} is an apocalyptic number.

20920358191019 is a deficient number, since it is larger than the sum of its proper divisors (3485274170401).

20920358191019 is an frugal number, since it uses more digits than its factorization.

20920358191019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8713185447 (or 8713185426 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 50.

The spelling of 20920358191019 in words is "twenty trillion, nine hundred twenty billion, three hundred fifty-eight million, one hundred ninety-one thousand, nineteen".