20628408 has 32 divisors (see below), whose sum is σ = 52108560. Its totient is φ = 6804480.

The previous prime is 20628403. The next prime is 20628409. The reversal of 20628408 is 80482602.

It is a happy number.

It is a super-2 number, since 2×20628408² = 851062433228928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20628403) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2103 + ... + 6758.

Almost surely, 2^20628408 is an apocalyptic number.

It is an amenable number.

20628408 is an abundant number, since it is smaller than the sum of its proper divisors (31480152).

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

20628408 is a wasteful number, since it uses less digits than its factorization.

20628408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8967 (or 8963 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 20628408 is about 4541.8507240992. The cubic root of 20628408 is about 274.2554316146.

The spelling of 20628408 in words is "twenty million, six hundred twenty-eight thousand, four hundred eight".