20042651641 has 4 divisors (see below), whose sum is σ = 20100411792. Its totient is φ = 19984891492.

The previous prime is 20042651617. The next prime is 20042651669. The reversal of 20042651641 is 14615624002.

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 20042651641 - 2⁵ = 20042651609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20042651141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28879555 + ... + 28880248.

It is an arithmetic number, because the mean of its divisors is an integer number (5025102948).

Almost surely, 2^20042651641 is an apocalyptic number.

It is an amenable number.

20042651641 is a deficient number, since it is larger than the sum of its proper divisors (57760151).

20042651641 is an equidigital number, since it uses as much as digits as its factorization.

20042651641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57760150.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 20042651641 in words is "twenty billion, forty-two million, six hundred fifty-one thousand, six hundred forty-one".