20722200 has 48 divisors (see below), whose sum is σ = 64240680. Its totient is φ = 5525760.

The previous prime is 20722199. The next prime is 20722237. The reversal of 20722200 is 222702.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20722200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16669 + ... + 17868.

Almost surely, 2^20722200 is an apocalyptic number.

20722200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20722200 is an abundant number, since it is smaller than the sum of its proper divisors (43518480).

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

20722200 is a wasteful number, since it uses less digits than its factorization.

20722200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34556 (or 34547 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 15.

The square root of 20722200 is about 4552.1643204085. The cubic root of 20722200 is about 274.6704592537.

Adding to 20722200 its reverse (222702), we get a palindrome (20944902).

The spelling of 20722200 in words is "twenty million, seven hundred twenty-two thousand, two hundred".