20077961 has 2 divisors, whose sum is σ = 20077962. Its totient is φ = 20077960.

The previous prime is 20077943. The next prime is 20077963. The reversal of 20077961 is 16977002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17272336 + 2805625 = 4156^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 20077961 - 2¹⁰ = 20076937 is a prime.

Together with 20077963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20077963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10038980 + 10038981.

It is an arithmetic number, because the mean of its divisors is an integer number (10038981).

Almost surely, 2^20077961 is an apocalyptic number.

It is an amenable number.

20077961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20077961 is an equidigital number, since it uses as much as digits as its factorization.

20077961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 20077961 is about 4480.8437821464. The cubic root of 20077961 is about 271.7940022244.

The spelling of 20077961 in words is "twenty million, seventy-seven thousand, nine hundred sixty-one".