20282121 has 12 divisors (see below), whose sum is σ = 29626740. Its totient is φ = 13368960.

The previous prime is 20282083. The next prime is 20282131. The reversal of 20282121 is 12128202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10112400 + 10169721 = 3180^2 + 3189^2 .

It is not a de Polignac number, because 20282121 - 2⁶ = 20282057 is a prime.

It is a super-2 number, since 2×20282121² = 822728864517282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20282094 and 20282103.

It is not an unprimeable number, because it can be changed into a prime (20282131) 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 11 ways as a sum of consecutive naturals, for example, 11860 + ... + 13461.

It is an arithmetic number, because the mean of its divisors is an integer number (2468895).

Almost surely, 2^20282121 is an apocalyptic number.

It is an amenable number.

20282121 is a deficient number, since it is larger than the sum of its proper divisors (9344619).

20282121 is a wasteful number, since it uses less digits than its factorization.

20282121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25416 (or 25413 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 20282121 is about 4503.5675858146. The cubic root of 20282121 is about 272.7121306442.

The spelling of 20282121 in words is "twenty million, two hundred eighty-two thousand, one hundred twenty-one".