20018640928212 has 36 divisors (see below), whose sum is σ = 50715376557300. Its totient is φ = 6658018655232.

The previous prime is 20018640928183. The next prime is 20018640928249. The reversal of 20018640928212 is 21282904681002.

20018640928212 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 8 + 6 + 409 + 28 + 212 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15398058529296 + 4620582398916 = 3924036^2 + 2149554^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20018640928212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 619219203 + ... + 619251530.

It is an arithmetic number, because the mean of its divisors is an integer number (1408760459925).

Almost surely, 2^{20018640928212} is an apocalyptic number.

It is an amenable number.

20018640928212 is an abundant number, since it is smaller than the sum of its proper divisors (30696735629088).

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

20018640928212 is a wasteful number, since it uses less digits than its factorization.

20018640928212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238471192 (or 1238471187 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 20018640928212 in words is "twenty trillion, eighteen billion, six hundred forty million, nine hundred twenty-eight thousand, two hundred twelve".