20988833 has 2 divisors, whose sum is σ = 20988834. Its totient is φ = 20988832.

The previous prime is 20988827. The next prime is 20988853. The reversal of 20988833 is 33888902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10543009 + 10445824 = 3247^2 + 3232^2 .

It is a cyclic number.

It is not a de Polignac number, because 20988833 - 2⁶ = 20988769 is a prime.

It is a super-2 number, since 2×20988833² = 881062221403778, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20988823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10494416 + 10494417.

It is an arithmetic number, because the mean of its divisors is an integer number (10494417).

Almost surely, 2^20988833 is an apocalyptic number.

It is an amenable number.

20988833 is a deficient number, since it is larger than the sum of its proper divisors (1).

20988833 is an equidigital number, since it uses as much as digits as its factorization.

20988833 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 20988833 is about 4581.3571133453. The cubic root of 20988833 is about 275.8435059415.

The spelling of 20988833 in words is "twenty million, nine hundred eighty-eight thousand, eight hundred thirty-three".