20283821 has 2 divisors, whose sum is σ = 20283822. Its totient is φ = 20283820.

The previous prime is 20283799. The next prime is 20283841. The reversal of 20283821 is 12838202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10329796 + 9954025 = 3214^2 + 3155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20283821 is a prime.

It is a super-2 number, since 2×20283821² = 822866788720082, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20283841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10141910 + 10141911.

It is an arithmetic number, because the mean of its divisors is an integer number (10141911).

Almost surely, 2^20283821 is an apocalyptic number.

It is an amenable number.

20283821 is a deficient number, since it is larger than the sum of its proper divisors (1).

20283821 is an equidigital number, since it uses as much as digits as its factorization.

20283821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 20283821 is about 4503.7563211169. The cubic root of 20283821 is about 272.7197497959.

The spelling of 20283821 in words is "twenty million, two hundred eighty-three thousand, eight hundred twenty-one".