20012211700 has 144 divisors (see below), whose sum is σ = 50160539520. Its totient is φ = 6867694080.

The previous prime is 20012211697. The next prime is 20012211761. The reversal of 20012211700 is 711221002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1301457 + ... + 1316743.

It is an arithmetic number, because the mean of its divisors is an integer number (348337080).

Almost surely, 2^20012211700 is an apocalyptic number.

20012211700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20012211700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25080269760).

20012211700 is an abundant number, since it is smaller than the sum of its proper divisors (30148327820).

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

20012211700 is a wasteful number, since it uses less digits than its factorization.

20012211700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15386 (or 15379 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

Adding to 20012211700 its reverse (711221002), we get a palindrome (20723432702).

The spelling of 20012211700 in words is "twenty billion, twelve million, two hundred eleven thousand, seven hundred".