20502401 has 2 divisors, whose sum is σ = 20502402. Its totient is φ = 20502400.

The previous prime is 20502389. The next prime is 20502479. The reversal of 20502401 is 10420502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16008001 + 4494400 = 4001^2 + 2120^2 .

It is a cyclic number.

It is not a de Polignac number, because 20502401 - 2¹⁸ = 20240257 is a prime.

It is not a weakly prime, because it can be changed into another prime (20502491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251200 + 10251201.

It is an arithmetic number, because the mean of its divisors is an integer number (10251201).

Almost surely, 2^20502401 is an apocalyptic number.

It is an amenable number.

20502401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20502401 is an equidigital number, since it uses as much as digits as its factorization.

20502401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20502401 is about 4527.9577073997. The cubic root of 20502401 is about 273.6958681704.

Adding to 20502401 its reverse (10420502), we get a palindrome (30922903).

The spelling of 20502401 in words is "twenty million, five hundred two thousand, four hundred one".