20280626 has 8 divisors (see below), whose sum is σ = 32210460. Its totient is φ = 9543808.

The previous prime is 20280607. The next prime is 20280661. The reversal of 20280626 is 62608202.

It can be written as a sum of positive squares in 2 ways, for example, as 19811401 + 469225 = 4451^2 + 685^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20280626² = 822607581903752, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20280595 and 20280604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298211 + ... + 298278.

Almost surely, 2^20280626 is an apocalyptic number.

20280626 is a deficient number, since it is larger than the sum of its proper divisors (11929834).

20280626 is a wasteful number, since it uses less digits than its factorization.

20280626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596508.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20280626 is about 4503.4016032328. The cubic root of 20280626 is about 272.7054299207.

Adding to 20280626 its reverse (62608202), we get a palindrome (82888828).

The spelling of 20280626 in words is "twenty million, two hundred eighty thousand, six hundred twenty-six".