20780226 has 20 divisors (see below), whose sum is σ = 46563462. Its totient is φ = 6926688.

The previous prime is 20780219. The next prime is 20780237. The reversal of 20780226 is 62208702.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 123201 = 4545^2 + 351^2 .

It is a super-2 number, since 2×20780226² = 863635585222152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20780226.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 63975 + ... + 64298.

Almost surely, 2^20780226 is an apocalyptic number.

20780226 is an abundant number, since it is smaller than the sum of its proper divisors (25783236).

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

20780226 is a wasteful number, since it uses less digits than its factorization.

20780226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128287 (or 128278 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20780226 is about 4558.5333167588. The cubic root of 20780226 is about 274.9265963866.

Adding to 20780226 its reverse (62208702), we get a palindrome (82988928).

The spelling of 20780226 in words is "twenty million, seven hundred eighty thousand, two hundred twenty-six".