20767121 has 2 divisors, whose sum is σ = 20767122. Its totient is φ = 20767120.

The previous prime is 20767111. The next prime is 20767127. The reversal of 20767121 is 12176702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18395521 + 2371600 = 4289^2 + 1540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20767121 is a prime.

It is not a weakly prime, because it can be changed into another prime (20767127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10383560 + 10383561.

It is an arithmetic number, because the mean of its divisors is an integer number (10383561).

Almost surely, 2^20767121 is an apocalyptic number.

It is an amenable number.

20767121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20767121 is an equidigital number, since it uses as much as digits as its factorization.

20767121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 20767121 is about 4557.0956759761. The cubic root of 20767121 is about 274.8687902989.

The spelling of 20767121 in words is "twenty million, seven hundred sixty-seven thousand, one hundred twenty-one".