20801479 has 2 divisors, whose sum is σ = 20801480. Its totient is φ = 20801478.

The previous prime is 20801471. The next prime is 20801483. The reversal of 20801479 is 97410802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20801479 - 2³ = 20801471 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20801479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20801471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10400739 + 10400740.

It is an arithmetic number, because the mean of its divisors is an integer number (10400740).

Almost surely, 2^20801479 is an apocalyptic number.

20801479 is a deficient number, since it is larger than the sum of its proper divisors (1).

20801479 is an equidigital number, since it uses as much as digits as its factorization.

20801479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20801479 is about 4560.8638436156. The cubic root of 20801479 is about 275.0202916156.

The spelling of 20801479 in words is "twenty million, eight hundred one thousand, four hundred seventy-nine".