20228689816 has 8 divisors (see below), whose sum is σ = 37928793420. Its totient is φ = 10114344904.

The previous prime is 20228689813. The next prime is 20228689823. The reversal of 20228689816 is 61898682202.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×20228689816² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20228689813) 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 as a sum of consecutive naturals, namely, 1264293106 + ... + 1264293121.

Almost surely, 2^20228689816 is an apocalyptic number.

It is an amenable number.

20228689816 is a deficient number, since it is larger than the sum of its proper divisors (17700103604).

20228689816 is a wasteful number, since it uses less digits than its factorization.

20228689816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528586233 (or 2528586229 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 52.

The spelling of 20228689816 in words is "twenty billion, two hundred twenty-eight million, six hundred eighty-nine thousand, eight hundred sixteen".