20473522236 has 18 divisors (see below), whose sum is σ = 51752514632. Its totient is φ = 6824507400.

The previous prime is 20473522213. The next prime is 20473522249. The reversal of 20473522236 is 63222537402.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×20473522236² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 568708951 = 20473522236 / (2 + 0 + 4 + 7 + 3 + 5 + 2 + 2 + 2 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 20473522236.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 284354440 + ... + 284354511.

Almost surely, 2^20473522236 is an apocalyptic number.

It is an amenable number.

20473522236 is an abundant number, since it is smaller than the sum of its proper divisors (31278992396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20473522236 is a wasteful number, since it uses less digits than its factorization.

20473522236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568708961 (or 568708956 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 36.

The spelling of 20473522236 in words is "twenty billion, four hundred seventy-three million, five hundred twenty-two thousand, two hundred thirty-six".