20816073556 has 12 divisors (see below), whose sum is σ = 36613044468. Its totient is φ = 10355203712.

The previous prime is 20816073541. The next prime is 20816073581. The reversal of 20816073556 is 65537061802.

It can be written as a sum of positive squares in 2 ways, for example, as 16207836100 + 4608237456 = 127310^2 + 67884^2 .

It is a super-4 number, since 4×20816073556⁴ (a number of 42 digits) contains 4444 as substring.

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, 13207381 + ... + 13208956.

It is an arithmetic number, because the mean of its divisors is an integer number (3051087039).

Almost surely, 2^20816073556 is an apocalyptic number.

It is an amenable number.

20816073556 is a deficient number, since it is larger than the sum of its proper divisors (15796970912).

20816073556 is a wasteful number, since it uses less digits than its factorization.

20816073556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26416538 (or 26416536 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 20816073556 in words is "twenty billion, eight hundred sixteen million, seventy-three thousand, five hundred fifty-six".