20616351491836 has 24 divisors (see below), whose sum is σ = 36670821059600. Its totient is φ = 10138980988800.

The previous prime is 20616351491737. The next prime is 20616351491873. The reversal of 20616351491836 is 63819415361602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11389240 + ... + 13074688.

Almost surely, 2^{20616351491836} is an apocalyptic number.

It is an amenable number.

20616351491836 is a deficient number, since it is larger than the sum of its proper divisors (16054469567764).

20616351491836 is a wasteful number, since it uses less digits than its factorization.

20616351491836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735645 (or 1735643 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 20616351491836 in words is "twenty trillion, six hundred sixteen billion, three hundred fifty-one million, four hundred ninety-one thousand, eight hundred thirty-six".