20019200091 has 8 divisors (see below), whose sum is σ = 29118836544. Its totient is φ = 12132848520.

The previous prime is 20019200087. The next prime is 20019200101. The reversal of 20019200091 is 19000291002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20019200091 - 2² = 20019200087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20019200021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303321181 + ... + 303321246.

It is an arithmetic number, because the mean of its divisors is an integer number (3639854568).

Almost surely, 2^20019200091 is an apocalyptic number.

20019200091 is a deficient number, since it is larger than the sum of its proper divisors (9099636453).

20019200091 is a wasteful number, since it uses less digits than its factorization.

20019200091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606642441.

The product of its (nonzero) digits is 324, while the sum is 24.

Adding to 20019200091 its reverse (19000291002), we get a palindrome (39019491093).

It can be divided in two parts, 200 and 19200091, that added together give a palindrome (19200291).

The spelling of 20019200091 in words is "twenty billion, nineteen million, two hundred thousand, ninety-one".