20280401 has 2 divisors, whose sum is σ = 20280402. Its totient is φ = 20280400.

The previous prime is 20280389. The next prime is 20280413. The reversal of 20280401 is 10408202.

It is a balanced prime because it is at equal distance from previous prime (20280389) and next prime (20280413).

It can be written as a sum of positive squares in only one way, i.e., 11730625 + 8549776 = 3425^2 + 2924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20280401 is a prime.

It is a super-2 number, since 2×20280401² = 822589329441602, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20280401.

It is not a weakly prime, because it can be changed into another prime (20280451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10140200 + 10140201.

It is an arithmetic number, because the mean of its divisors is an integer number (10140201).

Almost surely, 2^20280401 is an apocalyptic number.

It is an amenable number.

20280401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20280401 is an equidigital number, since it uses as much as digits as its factorization.

20280401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 20280401 is about 4503.3766220471. The cubic root of 20280401 is about 272.7044214221.

Adding to 20280401 its reverse (10408202), we get a palindrome (30688603).

The spelling of 20280401 in words is "twenty million, two hundred eighty thousand, four hundred one".