20989062644 has 24 divisors (see below), whose sum is σ = 40106253600. Its totient is φ = 9531858080.

The previous prime is 20989062641. The next prime is 20989062683. The reversal of 20989062644 is 44626098902.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20989062592 and 20989062601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20989062641) 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 7 ways as a sum of consecutive naturals, for example, 166274 + ... + 263865.

It is an arithmetic number, because the mean of its divisors is an integer number (1671093900).

Almost surely, 2^20989062644 is an apocalyptic number.

It is an amenable number.

20989062644 is a deficient number, since it is larger than the sum of its proper divisors (19117190956).

20989062644 is a wasteful number, since it uses less digits than its factorization.

20989062644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431263 (or 431261 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 50.

The spelling of 20989062644 in words is "twenty billion, nine hundred eighty-nine million, sixty-two thousand, six hundred forty-four".