20752091 has 2 divisors, whose sum is σ = 20752092. Its totient is φ = 20752090.

The previous prime is 20752073. The next prime is 20752133. The reversal of 20752091 is 19025702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20752091 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20752091.

It is not a weakly prime, because it can be changed into another prime (20752001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10376045 + 10376046.

It is an arithmetic number, because the mean of its divisors is an integer number (10376046).

Almost surely, 2^20752091 is an apocalyptic number.

20752091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20752091 is an equidigital number, since it uses as much as digits as its factorization.

20752091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 20752091 is about 4555.4463008579. The cubic root of 20752091 is about 274.8024630987.

Adding to 20752091 its reverse (19025702), we get a palindrome (39777793).

The spelling of 20752091 in words is "twenty million, seven hundred fifty-two thousand, ninety-one".