20952691 has 2 divisors, whose sum is σ = 20952692. Its totient is φ = 20952690.

The previous prime is 20952689. The next prime is 20952697. The reversal of 20952691 is 19625902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20952691 - 2¹ = 20952689 is a prime.

Together with 20952689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20952697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10476345 + 10476346.

It is an arithmetic number, because the mean of its divisors is an integer number (10476346).

Almost surely, 2^20952691 is an apocalyptic number.

20952691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20952691 is an equidigital number, since it uses as much as digits as its factorization.

20952691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 20952691 is about 4577.4109494342. The cubic root of 20952691 is about 275.6850841771.

It can be divided in two parts, 209 and 52691, that added together give a square (52900 = 230²).

The spelling of 20952691 in words is "twenty million, nine hundred fifty-two thousand, six hundred ninety-one".