20111663642 has 8 divisors (see below), whose sum is σ = 34477137696. Its totient is φ = 8619284412.

The previous prime is 20111663641. The next prime is 20111663653. The reversal of 20111663642 is 24636611102.

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

It is a junction number, because it is equal to n+sod(n) for n = 20111663599 and 20111663608.

It is not an unprimeable number, because it can be changed into a prime (20111663641) 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, 718273688 + ... + 718273715.

It is an arithmetic number, because the mean of its divisors is an integer number (4309642212).

Almost surely, 2^20111663642 is an apocalyptic number.

20111663642 is a deficient number, since it is larger than the sum of its proper divisors (14365474054).

20111663642 is a wasteful number, since it uses less digits than its factorization.

20111663642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436547412.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 20111663642 in words is "twenty billion, one hundred eleven million, six hundred sixty-three thousand, six hundred forty-two".