20280668 has 6 divisors (see below), whose sum is σ = 35491176. Its totient is φ = 10140332.

The previous prime is 20280661. The next prime is 20280671. The reversal of 20280668 is 86608202.

It is a happy number.

It is a super-2 number, since 2×20280668² = 822610989052448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20280661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2535080 + ... + 2535087.

It is an arithmetic number, because the mean of its divisors is an integer number (5915196).

Almost surely, 2^20280668 is an apocalyptic number.

It is an amenable number.

20280668 is a deficient number, since it is larger than the sum of its proper divisors (15210508).

20280668 is a wasteful number, since it uses less digits than its factorization.

20280668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5070171 (or 5070169 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 20280668 is about 4503.4062663722. The cubic root of 20280668 is about 272.7056181729.

The spelling of 20280668 in words is "twenty million, two hundred eighty thousand, six hundred sixty-eight".