20827799 has 2 divisors, whose sum is σ = 20827800. Its totient is φ = 20827798.

The previous prime is 20827789. The next prime is 20827813. The reversal of 20827799 is 99772802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20827799 - 2⁴ = 20827783 is a prime.

It is a super-2 number, since 2×20827799² = 867594422368802, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20827769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10413899 + 10413900.

It is an arithmetic number, because the mean of its divisors is an integer number (10413900).

Almost surely, 2^20827799 is an apocalyptic number.

20827799 is a deficient number, since it is larger than the sum of its proper divisors (1).

20827799 is an equidigital number, since it uses as much as digits as its factorization.

20827799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 20827799 is about 4563.7483497669. The cubic root of 20827799 is about 275.1362366287.

The spelling of 20827799 in words is "twenty million, eight hundred twenty-seven thousand, seven hundred ninety-nine".