20952091 has 2 divisors, whose sum is σ = 20952092. Its totient is φ = 20952090.

The previous prime is 20952077. The next prime is 20952161. The reversal of 20952091 is 19025902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20952091 - 2¹⁷ = 20821019 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20952691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10476045 + 10476046.

It is an arithmetic number, because the mean of its divisors is an integer number (10476046).

Almost surely, 2^20952091 is an apocalyptic number.

20952091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20952091 is an equidigital number, since it uses as much as digits as its factorization.

20952091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 20952091 is about 4577.3454097326. The cubic root of 20952091 is about 275.6824526515.

Adding to 20952091 its reverse (19025902), we get a palindrome (39977993).

It can be divided in two parts, 2095 and 2091, that added together give a triangular number (4186 = T₉₁).

The spelling of 20952091 in words is "twenty million, nine hundred fifty-two thousand, ninety-one".