20507401 has 2 divisors, whose sum is σ = 20507402. Its totient is φ = 20507400.

The previous prime is 20507387. The next prime is 20507419. The reversal of 20507401 is 10470502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15327225 + 5180176 = 3915^2 + 2276^2 .

It is a cyclic number.

It is not a de Polignac number, because 20507401 - 2⁷ = 20507273 is a prime.

It is not a weakly prime, because it can be changed into another prime (20507471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253700 + 10253701.

It is an arithmetic number, because the mean of its divisors is an integer number (10253701).

Almost surely, 2^20507401 is an apocalyptic number.

It is an amenable number.

20507401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20507401 is an equidigital number, since it uses as much as digits as its factorization.

20507401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20507401 is about 4528.5097990399. The cubic root of 20507401 is about 273.7181154527.

Adding to 20507401 its reverse (10470502), we get a palindrome (30977903).

The spelling of 20507401 in words is "twenty million, five hundred seven thousand, four hundred one".