20524681 has 2 divisors, whose sum is σ = 20524682. Its totient is φ = 20524680.

The previous prime is 20524667. The next prime is 20524739. The reversal of 20524681 is 18642502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20331081 + 193600 = 4509^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 20524681 - 2²³ = 12136073 is a prime.

It is a super-2 number, since 2×20524681² = 842525060303522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20524081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10262340 + 10262341.

It is an arithmetic number, because the mean of its divisors is an integer number (10262341).

Almost surely, 2^20524681 is an apocalyptic number.

It is an amenable number.

20524681 is a deficient number, since it is larger than the sum of its proper divisors (1).

20524681 is an equidigital number, since it uses as much as digits as its factorization.

20524681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20524681 is about 4530.4173096968. The cubic root of 20524681 is about 273.7949742278.

The spelling of 20524681 in words is "twenty million, five hundred twenty-four thousand, six hundred eighty-one".