20803961 has 2 divisors, whose sum is σ = 20803962. Its totient is φ = 20803960.

The previous prime is 20803957. The next prime is 20803987. The reversal of 20803961 is 16930802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20647936 + 156025 = 4544^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 20803961 - 2² = 20803957 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20803901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10401980 + 10401981.

It is an arithmetic number, because the mean of its divisors is an integer number (10401981).

Almost surely, 2^20803961 is an apocalyptic number.

It is an amenable number.

20803961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20803961 is an equidigital number, since it uses as much as digits as its factorization.

20803961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 20803961 is about 4561.1359330763. The cubic root of 20803961 is about 275.0312295112.

The spelling of 20803961 in words is "twenty million, eight hundred three thousand, nine hundred sixty-one".