20000028 has 24 divisors (see below), whose sum is σ = 46932480. Its totient is φ = 6628720.

The previous prime is 20000023. The next prime is 20000033. The reversal of 20000028 is 82000002.

It is an interprime number because it is at equal distance from previous prime (20000023) and next prime (20000033).

It is a super-2 number, since 2×20000028² = 800002240001568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

20000028 is a modest number, since divided by 28 gives 20 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 19999968 and 20000022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000023) 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 7 ways as a sum of consecutive naturals, for example, 2508 + ... + 6803.

It is an arithmetic number, because the mean of its divisors is an integer number (1955520).

Almost surely, 2^20000028 is an apocalyptic number.

It is an amenable number.

20000028 is an abundant number, since it is smaller than the sum of its proper divisors (26932452).

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

20000028 is a wasteful number, since it uses less digits than its factorization.

20000028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9497 (or 9495 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 20000028 is about 4472.1390854937. The cubic root of 20000028 is about 271.4418883323.

It can be divided in two parts, 200000 and 28, that added together give a triangular number (200028 = T₆₃₂).

The spelling of 20000028 in words is "twenty million, twenty-eight", and thus it is an aban number and an uban number.