20100028 has 48 divisors (see below), whose sum is σ = 40278784. Its totient is φ = 8709120.

The previous prime is 20100023. The next prime is 20100053. The reversal of 20100028 is 82000102.

It is a super-2 number, since 2×20100028² = 808022251201568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 20099990 and 20100017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59476 + ... + 59812.

Almost surely, 2^20100028 is an apocalyptic number.

It is an amenable number.

20100028 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

20100028 is a wasteful number, since it uses less digits than its factorization.

20100028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 20100028 is about 4483.3054769890. The cubic root of 20100028 is about 271.8935389305.

The spelling of 20100028 in words is "twenty million, one hundred thousand, twenty-eight".