20016211720 has 64 divisors (see below), whose sum is σ = 45343411200. Its totient is φ = 7952056320.

The previous prime is 20016211717. The next prime is 20016211739. The reversal of 20016211720 is 2711261002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20016211691 and 20016211700.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6011016 + ... + 6014344.

It is an arithmetic number, because the mean of its divisors is an integer number (708490800).

Almost surely, 2^20016211720 is an apocalyptic number.

20016211720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20016211720 is an abundant number, since it is smaller than the sum of its proper divisors (25327199480).

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

20016211720 is a wasteful number, since it uses less digits than its factorization.

20016211720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4318 (or 4314 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

Adding to 20016211720 its reverse (2711261002), we get a palindrome (22727472722).

The spelling of 20016211720 in words is "twenty billion, sixteen million, two hundred eleven thousand, seven hundred twenty".