20090977 has 2 divisors, whose sum is σ = 20090978. Its totient is φ = 20090976.

The previous prime is 20090971. The next prime is 20091023. The reversal of 20090977 is 77909002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10751841 + 9339136 = 3279^2 + 3056^2 .

It is a cyclic number.

It is not a de Polignac number, because 20090977 - 2³ = 20090969 is a prime.

It is not a weakly prime, because it can be changed into another prime (20090971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10045488 + 10045489.

It is an arithmetic number, because the mean of its divisors is an integer number (10045489).

Almost surely, 2^20090977 is an apocalyptic number.

It is an amenable number.

20090977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20090977 is an equidigital number, since it uses as much as digits as its factorization.

20090977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 20090977 is about 4482.2959518532. The cubic root of 20090977 is about 271.8527217752.

Adding to 20090977 its reverse (77909002), we get a palindrome (97999979).

The spelling of 20090977 in words is "twenty million, ninety thousand, nine hundred seventy-seven".