20145701 has 2 divisors, whose sum is σ = 20145702. Its totient is φ = 20145700.

The previous prime is 20145689. The next prime is 20145709. The reversal of 20145701 is 10754102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14025025 + 6120676 = 3745^2 + 2474^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20145701 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20145709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10072850 + 10072851.

It is an arithmetic number, because the mean of its divisors is an integer number (10072851).

Almost surely, 2^20145701 is an apocalyptic number.

It is an amenable number.

20145701 is a deficient number, since it is larger than the sum of its proper divisors (1).

20145701 is an equidigital number, since it uses as much as digits as its factorization.

20145701 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 20.

The square root of 20145701 is about 4488.3962614725. The cubic root of 20145701 is about 272.0993230479.

Adding to 20145701 its reverse (10754102), we get a palindrome (30899803).

The spelling of 20145701 in words is "twenty million, one hundred forty-five thousand, seven hundred one".