20809428873488 has 20 divisors (see below), whose sum is σ = 40608327931920. Its totient is φ = 10329860374944.

The previous prime is 20809428873487. The next prime is 20809428873503. The reversal of 20809428873488 is 88437882490802.

It is a super-2 number, since 2×20809428873488² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20809428873487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4678376570 + ... + 4678381017.

It is an arithmetic number, because the mean of its divisors is an integer number (2030416396596).

Almost surely, 2^{20809428873488} is an apocalyptic number.

It is an amenable number.

20809428873488 is a deficient number, since it is larger than the sum of its proper divisors (19798899058432).

20809428873488 is a wasteful number, since it uses less digits than its factorization.

20809428873488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9356757734 (or 9356757728 counting only the distinct ones).

The product of its (nonzero) digits is 396361728, while the sum is 71.

The spelling of 20809428873488 in words is "twenty trillion, eight hundred nine billion, four hundred twenty-eight million, eight hundred seventy-three thousand, four hundred eighty-eight".