20855479 has 2 divisors, whose sum is σ = 20855480. Its totient is φ = 20855478.

The previous prime is 20855453. The next prime is 20855489. The reversal of 20855479 is 97455802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20855479 - 2¹⁹ = 20331191 is a prime.

It is a super-3 number, since 3×20855479³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20855489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10427739 + 10427740.

It is an arithmetic number, because the mean of its divisors is an integer number (10427740).

Almost surely, 2^20855479 is an apocalyptic number.

20855479 is a deficient number, since it is larger than the sum of its proper divisors (1).

20855479 is an equidigital number, since it uses as much as digits as its factorization.

20855479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 20855479 is about 4566.7799377680. The cubic root of 20855479 is about 275.2580673887.

The spelling of 20855479 in words is "twenty million, eight hundred fifty-five thousand, four hundred seventy-nine".