20912377 has 2 divisors, whose sum is σ = 20912378. Its totient is φ = 20912376.

The previous prime is 20912351. The next prime is 20912417. The reversal of 20912377 is 77321902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18870336 + 2042041 = 4344^2 + 1429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20912377 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20912317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10456188 + 10456189.

It is an arithmetic number, because the mean of its divisors is an integer number (10456189).

Almost surely, 2^20912377 is an apocalyptic number.

It is an amenable number.

20912377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20912377 is an equidigital number, since it uses as much as digits as its factorization.

20912377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 20912377 is about 4573.0052481929. The cubic root of 20912377 is about 275.5081601399.

The spelling of 20912377 in words is "twenty million, nine hundred twelve thousand, three hundred seventy-seven".