20195644774 has 4 divisors (see below), whose sum is σ = 30293467164. Its totient is φ = 10097822386.

The previous prime is 20195644759. The next prime is 20195644783. The reversal of 20195644774 is 47744659102.

It is a happy number.

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

It is a super-2 number, since 2×20195644774² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5048911192 + ... + 5048911195.

It is an arithmetic number, because the mean of its divisors is an integer number (7573366791).

Almost surely, 2^20195644774 is an apocalyptic number.

20195644774 is a deficient number, since it is larger than the sum of its proper divisors (10097822390).

20195644774 is a wasteful number, since it uses less digits than its factorization.

20195644774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10097822389.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 20195644774 in words is "twenty billion, one hundred ninety-five million, six hundred forty-four thousand, seven hundred seventy-four".