20827913 has 2 divisors, whose sum is σ = 20827914. Its totient is φ = 20827912.

The previous prime is 20827897. The next prime is 20827957. The reversal of 20827913 is 31972802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15272464 + 5555449 = 3908^2 + 2357^2 .

It is a cyclic number.

It is not a de Polignac number, because 20827913 - 2⁴ = 20827897 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20827913.

It is not a weakly prime, because it can be changed into another prime (20827013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10413956 + 10413957.

It is an arithmetic number, because the mean of its divisors is an integer number (10413957).

Almost surely, 2^20827913 is an apocalyptic number.

It is an amenable number.

20827913 is a deficient number, since it is larger than the sum of its proper divisors (1).

20827913 is an equidigital number, since it uses as much as digits as its factorization.

20827913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 20827913 is about 4563.7608394832. The cubic root of 20827913 is about 275.1367386096.

The spelling of 20827913 in words is "twenty million, eight hundred twenty-seven thousand, nine hundred thirteen".