20906377 has 2 divisors, whose sum is σ = 20906378. Its totient is φ = 20906376.

The previous prime is 20906371. The next prime is 20906387. The reversal of 20906377 is 77360902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18844281 + 2062096 = 4341^2 + 1436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20906377 is a prime.

It is a super-2 number, since 2×20906377² = 874153198532258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20906371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10453188 + 10453189.

It is an arithmetic number, because the mean of its divisors is an integer number (10453189).

Almost surely, 2^20906377 is an apocalyptic number.

It is an amenable number.

20906377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20906377 is an equidigital number, since it uses as much as digits as its factorization.

20906377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 20906377 is about 4572.3491773923. The cubic root of 20906377 is about 275.4818088061.

The spelling of 20906377 in words is "twenty million, nine hundred six thousand, three hundred seventy-seven".