20522987 has 2 divisors, whose sum is σ = 20522988. Its totient is φ = 20522986.

The previous prime is 20522977. The next prime is 20523053. The reversal of 20522987 is 78922502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20522987 - 2⁸ = 20522731 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20522977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261493 + 10261494.

It is an arithmetic number, because the mean of its divisors is an integer number (10261494).

Almost surely, 2^20522987 is an apocalyptic number.

20522987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20522987 is an equidigital number, since it uses as much as digits as its factorization.

20522987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20522987 is about 4530.2303473444. The cubic root of 20522987 is about 273.7874414847.

The spelling of 20522987 in words is "twenty million, five hundred twenty-two thousand, nine hundred eighty-seven".