20787401 has 2 divisors, whose sum is σ = 20787402. Its totient is φ = 20787400.

The previous prime is 20787383. The next prime is 20787409. The reversal of 20787401 is 10478702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15217801 + 5569600 = 3901^2 + 2360^2 .

It is a cyclic number.

It is not a de Polignac number, because 20787401 - 2⁶ = 20787337 is a prime.

It is not a weakly prime, because it can be changed into another prime (20787409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10393700 + 10393701.

It is an arithmetic number, because the mean of its divisors is an integer number (10393701).

Almost surely, 2^20787401 is an apocalyptic number.

It is an amenable number.

20787401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20787401 is an equidigital number, since it uses as much as digits as its factorization.

20787401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 20787401 is about 4559.3202344209. The cubic root of 20787401 is about 274.9582349797.

The spelling of 20787401 in words is "twenty million, seven hundred eighty-seven thousand, four hundred one".