20696881 has 2 divisors, whose sum is σ = 20696882. Its totient is φ = 20696880.

The previous prime is 20696869. The next prime is 20696911. The reversal of 20696881 is 18869602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17514225 + 3182656 = 4185^2 + 1784^2 .

It is a cyclic number.

It is not a de Polignac number, because 20696881 - 2¹⁵ = 20664113 is a prime.

It is a super-2 number, since 2×20696881² = 856721766256322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20696281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10348440 + 10348441.

It is an arithmetic number, because the mean of its divisors is an integer number (10348441).

Almost surely, 2^20696881 is an apocalyptic number.

It is an amenable number.

20696881 is a deficient number, since it is larger than the sum of its proper divisors (1).

20696881 is an equidigital number, since it uses as much as digits as its factorization.

20696881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 20696881 is about 4549.3824855688. The cubic root of 20696881 is about 274.5585468178.

The spelling of 20696881 in words is "twenty million, six hundred ninety-six thousand, eight hundred eighty-one".