20924987 has 2 divisors, whose sum is σ = 20924988. Its totient is φ = 20924986.

The previous prime is 20924957. The next prime is 20925019. The reversal of 20924987 is 78942902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20924987 - 2¹⁰ = 20923963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20924957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10462493 + 10462494.

It is an arithmetic number, because the mean of its divisors is an integer number (10462494).

Almost surely, 2^20924987 is an apocalyptic number.

20924987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20924987 is an equidigital number, since it uses as much as digits as its factorization.

20924987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 20924987 is about 4574.3837836369. The cubic root of 20924987 is about 275.5635254360.

The spelling of 20924987 in words is "twenty million, nine hundred twenty-four thousand, nine hundred eighty-seven".