20028408 has 32 divisors (see below), whose sum is σ = 50472960. Its totient is φ = 6622560.

The previous prime is 20028391. The next prime is 20028409. The reversal of 20028408 is 80482002.

It is a super-2 number, since 2×20028408² = 802274254028928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20028409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238 + ... + 6333.

It is an arithmetic number, because the mean of its divisors is an integer number (1577280).

Almost surely, 2^20028408 is an apocalyptic number.

It is an amenable number.

20028408 is an abundant number, since it is smaller than the sum of its proper divisors (30444552).

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

20028408 is a wasteful number, since it uses less digits than its factorization.

20028408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6707 (or 6703 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 20028408 is about 4475.3109389181. The cubic root of 20028408 is about 271.5702194843.

The spelling of 20028408 in words is "twenty million, twenty-eight thousand, four hundred eight".