20280413 has 2 divisors, whose sum is σ = 20280414. Its totient is φ = 20280412.

The previous prime is 20280401. The next prime is 20280419. The reversal of 20280413 is 31408202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11648569 + 8631844 = 3413^2 + 2938^2 .

It is a cyclic number.

It is not a de Polignac number, because 20280413 - 2⁸ = 20280157 is a prime.

It is a super-2 number, since 2×20280413² = 822590302901138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20280419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10140206 + 10140207.

It is an arithmetic number, because the mean of its divisors is an integer number (10140207).

Almost surely, 2^20280413 is an apocalyptic number.

It is an amenable number.

20280413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20280413 is an equidigital number, since it uses as much as digits as its factorization.

20280413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20280413 is about 4503.3779543805. The cubic root of 20280413 is about 272.7044752089.

Adding to 20280413 its reverse (31408202), we get a palindrome (51688615).

The spelling of 20280413 in words is "twenty million, two hundred eighty thousand, four hundred thirteen".