20679587 has 2 divisors, whose sum is σ = 20679588. Its totient is φ = 20679586.

The previous prime is 20679583. The next prime is 20679613. The reversal of 20679587 is 78597602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20679587 - 2² = 20679583 is a prime.

It is not a weakly prime, because it can be changed into another prime (20679583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339793 + 10339794.

It is an arithmetic number, because the mean of its divisors is an integer number (10339794).

Almost surely, 2^20679587 is an apocalyptic number.

20679587 is a deficient number, since it is larger than the sum of its proper divisors (1).

20679587 is an equidigital number, since it uses as much as digits as its factorization.

20679587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 20679587 is about 4547.4813908360. The cubic root of 20679587 is about 274.4820531883.

The spelling of 20679587 in words is "twenty million, six hundred seventy-nine thousand, five hundred eighty-seven".