20213642236 has 12 divisors (see below), whose sum is σ = 35376958512. Its totient is φ = 10105939808.

The previous prime is 20213642203. The next prime is 20213642249. The reversal of 20213642236 is 63224631202.

It is a junction number, because it is equal to n+sod(n) for n = 20213642198 and 20213642207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167305 + ... + 261568.

It is an arithmetic number, because the mean of its divisors is an integer number (2948079876).

Almost surely, 2^20213642236 is an apocalyptic number.

It is an amenable number.

20213642236 is a deficient number, since it is larger than the sum of its proper divisors (15163316276).

20213642236 is a wasteful number, since it uses less digits than its factorization.

20213642236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440660 (or 440658 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

The spelling of 20213642236 in words is "twenty billion, two hundred thirteen million, six hundred forty-two thousand, two hundred thirty-six".