20616021200 has 30 divisors (see below), whose sum is σ = 49529991894. Its totient is φ = 8246408320.

The previous prime is 20616021199. The next prime is 20616021247. The reversal of 20616021200 is 212061602.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4376087104 + 16239934096 = 66152^2 + 127436^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25769627 + ... + 25770426.

Almost surely, 2^20616021200 is an apocalyptic number.

20616021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20616021200 is an abundant number, since it is smaller than the sum of its proper divisors (28913970694).

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

20616021200 is a wasteful number, since it uses less digits than its factorization.

20616021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51540071 (or 51540060 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 20616021200 its reverse (212061602), we get a palindrome (20828082802).

The spelling of 20616021200 in words is "twenty billion, six hundred sixteen million, twenty-one thousand, two hundred".