20194915641 has 4 divisors (see below), whose sum is σ = 26926554192. Its totient is φ = 13463277092.

The previous prime is 20194915633. The next prime is 20194915661. The reversal of 20194915641 is 14651949102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20194915641 - 2³ = 20194915633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20194915593 and 20194915602.

It is not an unprimeable number, because it can be changed into a prime (20194915661) 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, 3365819271 + ... + 3365819276.

It is an arithmetic number, because the mean of its divisors is an integer number (6731638548).

Almost surely, 2^20194915641 is an apocalyptic number.

It is an amenable number.

20194915641 is a deficient number, since it is larger than the sum of its proper divisors (6731638551).

20194915641 is an equidigital number, since it uses as much as digits as its factorization.

20194915641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6731638550.

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 20194915641 in words is "twenty billion, one hundred ninety-four million, nine hundred fifteen thousand, six hundred forty-one".