20147801 has 2 divisors, whose sum is σ = 20147802. Its totient is φ = 20147800.

The previous prime is 20147789. The next prime is 20147807. The reversal of 20147801 is 10874102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19811401 + 336400 = 4451^2 + 580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20147801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20147807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10073900 + 10073901.

It is an arithmetic number, because the mean of its divisors is an integer number (10073901).

Almost surely, 2^20147801 is an apocalyptic number.

It is an amenable number.

20147801 is a deficient number, since it is larger than the sum of its proper divisors (1).

20147801 is an equidigital number, since it uses as much as digits as its factorization.

20147801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20147801 is about 4488.6301919405. The cubic root of 20147801 is about 272.1087773185.

The spelling of 20147801 in words is "twenty million, one hundred forty-seven thousand, eight hundred one".