20622977 has 2 divisors, whose sum is σ = 20622978. Its totient is φ = 20622976.

The previous prime is 20622911. The next prime is 20622983. The reversal of 20622977 is 77922602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13868176 + 6754801 = 3724^2 + 2599^2 .

It is a cyclic number.

It is not a de Polignac number, because 20622977 - 2¹² = 20618881 is a prime.

It is not a weakly prime, because it can be changed into another prime (20622677) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10311488 + 10311489.

It is an arithmetic number, because the mean of its divisors is an integer number (10311489).

Almost surely, 2^20622977 is an apocalyptic number.

It is an amenable number.

20622977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20622977 is an equidigital number, since it uses as much as digits as its factorization.

20622977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 20622977 is about 4541.2528007148. The cubic root of 20622977 is about 274.2313610548.

The spelling of 20622977 in words is "twenty million, six hundred twenty-two thousand, nine hundred seventy-seven".