20021111205 has 64 divisors (see below), whose sum is σ = 34934630400. Its totient is φ = 9752520960.

The previous prime is 20021111161. The next prime is 20021111239. The reversal of 20021111205 is 50211112002.

It is not a de Polignac number, because 20021111205 - 2⁶ = 20021111141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7329690 + ... + 7332420.

It is an arithmetic number, because the mean of its divisors is an integer number (545853600).

Almost surely, 2^20021111205 is an apocalyptic number.

It is an amenable number.

20021111205 is a deficient number, since it is larger than the sum of its proper divisors (14913519195).

20021111205 is a wasteful number, since it uses less digits than its factorization.

20021111205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 20021111205 its reverse (50211112002), we get a palindrome (70232223207).

The spelling of 20021111205 in words is "twenty billion, twenty-one million, one hundred eleven thousand, two hundred five".