20780272 has 20 divisors (see below), whose sum is σ = 40946040. Its totient is φ = 10213568.

The previous prime is 20780257. The next prime is 20780303. The reversal of 20780272 is 27208702.

It is a self number, because there is not a number n which added to its sum of digits gives 20780272.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10063 + ... + 11950.

It is an arithmetic number, because the mean of its divisors is an integer number (2047302).

Almost surely, 2^20780272 is an apocalyptic number.

It is an amenable number.

20780272 is a deficient number, since it is larger than the sum of its proper divisors (20165768).

20780272 is a wasteful number, since it uses less digits than its factorization.

20780272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22080 (or 22074 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 20780272 is about 4558.5383622385. The cubic root of 20780272 is about 274.9267992496.

Adding to 20780272 its reverse (27208702), we get a palindrome (47988974).

The spelling of 20780272 in words is "twenty million, seven hundred eighty thousand, two hundred seventy-two".