20822399 has 8 divisors (see below), whose sum is σ = 23743440. Its totient is φ = 18089856.

The previous prime is 20822393. The next prime is 20822407. The reversal of 20822399 is 99322802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20822399 - 2⁸ = 20822143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20822393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46889 + ... + 47330.

It is an arithmetic number, because the mean of its divisors is an integer number (2967930).

Almost surely, 2^20822399 is an apocalyptic number.

20822399 is a deficient number, since it is larger than the sum of its proper divisors (2921041).

20822399 is a wasteful number, since it uses less digits than its factorization.

20822399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94249.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20822399 is about 4563.1566924663. The cubic root of 20822399 is about 275.1124564859.

It can be divided in two parts, 20 and 822399, that multiplied together give a triangular number (16447980 = T₅₇₃₅).

The spelling of 20822399 in words is "twenty million, eight hundred twenty-two thousand, three hundred ninety-nine".