20628306 has 24 divisors (see below), whose sum is σ = 44778240. Its totient is φ = 6863256.

The previous prime is 20628287. The next prime is 20628313. The reversal of 20628306 is 60382602.

20628306 is a `hidden beast` number, since 2 + 0 + 628 + 30 + 6 = 666.

It is a super-3 number, since 3×20628306³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20628306.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18151 + ... + 19253.

It is an arithmetic number, because the mean of its divisors is an integer number (1865760).

Almost surely, 2^20628306 is an apocalyptic number.

20628306 is an abundant number, since it is smaller than the sum of its proper divisors (24149934).

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

20628306 is a wasteful number, since it uses less digits than its factorization.

20628306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150 (or 2147 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20628306 is about 4541.8394951825. The cubic root of 20628306 is about 274.2549795826.

The spelling of 20628306 in words is "twenty million, six hundred twenty-eight thousand, three hundred six".