20280461 has 2 divisors, whose sum is σ = 20280462. Its totient is φ = 20280460.

The previous prime is 20280451. The next prime is 20280493. The reversal of 20280461 is 16408202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15132100 + 5148361 = 3890^2 + 2269^2 .

It is a cyclic number.

It is not a de Polignac number, because 20280461 - 2¹⁰ = 20279437 is a prime.

It is a super-2 number, since 2×20280461² = 822594196745042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20280401) 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 as a sum of consecutive naturals, namely, 10140230 + 10140231.

It is an arithmetic number, because the mean of its divisors is an integer number (10140231).

Almost surely, 2^20280461 is an apocalyptic number.

It is an amenable number.

20280461 is a deficient number, since it is larger than the sum of its proper divisors (1).

20280461 is an equidigital number, since it uses as much as digits as its factorization.

20280461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20280461 is about 4503.3832837101. The cubic root of 20280461 is about 272.7046903558.

Adding to 20280461 its reverse (16408202), we get a palindrome (36688663).

The spelling of 20280461 in words is "twenty million, two hundred eighty thousand, four hundred sixty-one".