20520746236 has 48 divisors (see below), whose sum is σ = 37747084032. Its totient is φ = 9748569600.

The previous prime is 20520746209. The next prime is 20520746273. The reversal of 20520746236 is 63264702502.

It is a super-2 number, since 2×20520746236² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20520746195 and 20520746204.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4664790 + ... + 4669186.

It is an arithmetic number, because the mean of its divisors is an integer number (786397584).

Almost surely, 2^20520746236 is an apocalyptic number.

It is an amenable number.

20520746236 is a deficient number, since it is larger than the sum of its proper divisors (17226337796).

20520746236 is a wasteful number, since it uses less digits than its factorization.

20520746236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5110 (or 5108 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 37.

The spelling of 20520746236 in words is "twenty billion, five hundred twenty million, seven hundred forty-six thousand, two hundred thirty-six".