20280386 has 32 divisors (see below), whose sum is σ = 36384768. Its totient is φ = 8295120.

The previous prime is 20280373. The next prime is 20280389. The reversal of 20280386 is 68308202.

It is a super-2 number, since 2×20280386² = 822588112617992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20280389) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 35741 + ... + 36303.

It is an arithmetic number, because the mean of its divisors is an integer number (1137024).

Almost surely, 2^20280386 is an apocalyptic number.

20280386 is a deficient number, since it is larger than the sum of its proper divisors (16104382).

20280386 is a wasteful number, since it uses less digits than its factorization.

20280386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20280386 is about 4503.3749566297. The cubic root of 20280386 is about 272.7043541886.

Adding to 20280386 its reverse (68308202), we get a palindrome (88588588).

The spelling of 20280386 in words is "twenty million, two hundred eighty thousand, three hundred eighty-six".