20603977 has 2 divisors, whose sum is σ = 20603978. Its totient is φ = 20603976.

The previous prime is 20603971. The next prime is 20603993. The reversal of 20603977 is 77930602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19324816 + 1279161 = 4396^2 + 1131^2 .

It is a cyclic number.

It is not a de Polignac number, because 20603977 - 2³ = 20603969 is a prime.

It is not a weakly prime, because it can be changed into another prime (20603971) 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, 10301988 + 10301989.

It is an arithmetic number, because the mean of its divisors is an integer number (10301989).

Almost surely, 2^20603977 is an apocalyptic number.

It is an amenable number.

20603977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20603977 is an equidigital number, since it uses as much as digits as its factorization.

20603977 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 20603977 is about 4539.1603849170. The cubic root of 20603977 is about 274.1471185002.

It can be divided in two parts, 206039 and 77, that added together give a square (206116 = 454²).

The spelling of 20603977 in words is "twenty million, six hundred three thousand, nine hundred seventy-seven".