20228281000 has 32 divisors (see below), whose sum is σ = 47334179880. Its totient is φ = 8091312000.

The previous prime is 20228280953. The next prime is 20228281009. The reversal of 20228281000 is 18282202.

It can be written as a sum of positive squares in 4 ways, for example, as 8831864484 + 11396416516 = 93978^2 + 106754^2 .

It is a super-2 number, since 2×20228281000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20228281009) 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, 10113141 + ... + 10115140.

Almost surely, 2^20228281000 is an apocalyptic number.

20228281000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20228281000 is an abundant number, since it is smaller than the sum of its proper divisors (27105898880).

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

20228281000 is a wasteful number, since it uses less digits than its factorization.

20228281000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20228302 (or 20228288 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The spelling of 20228281000 in words is "twenty billion, two hundred twenty-eight million, two hundred eighty-one thousand".