20447799 has 8 divisors (see below), whose sum is σ = 27393792. Its totient is φ = 13566840.

The previous prime is 20447789. The next prime is 20447803. The reversal of 20447799 is 99774402.

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

It is not a de Polignac number, because 20447799 - 2⁷ = 20447671 is a prime.

It is a super-2 number, since 2×20447799² = 836224967888802, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20447799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20447729) 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, 15519 + ... + 16784.

It is an arithmetic number, because the mean of its divisors is an integer number (3424224).

Almost surely, 2^20447799 is an apocalyptic number.

20447799 is a deficient number, since it is larger than the sum of its proper divisors (6945993).

20447799 is a wasteful number, since it uses less digits than its factorization.

20447799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32517.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 20447799 is about 4521.9242585430. The cubic root of 20447799 is about 273.4526831885.

The spelling of 20447799 in words is "twenty million, four hundred forty-seven thousand, seven hundred ninety-nine".