20727272 has 8 divisors (see below), whose sum is σ = 38863650. Its totient is φ = 10363632.

The previous prime is 20727269. The next prime is 20727281. The reversal of 20727272 is 27272702.

It can be written as a sum of positive squares in only one way, i.e., 11930116 + 8797156 = 3454^2 + 2966^2 .

It is a tau number, because it is divible by the number of its divisors (8).

20727272 is a modest number, since divided by 7272 gives 2072 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1295447 + ... + 1295462.

Almost surely, 2^20727272 is an apocalyptic number.

It is an amenable number.

20727272 is a deficient number, since it is larger than the sum of its proper divisors (18136378).

20727272 is a wasteful number, since it uses less digits than its factorization.

20727272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2590915 (or 2590911 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 29.

The square root of 20727272 is about 4552.7213839637. The cubic root of 20727272 is about 274.6928670245.

Adding to 20727272 its reverse (27272702), we get a palindrome (47999974).

The spelling of 20727272 in words is "twenty million, seven hundred twenty-seven thousand, two hundred seventy-two".