20779824 has 40 divisors (see below), whose sum is σ = 57812272. Its totient is φ = 6393600.

The previous prime is 20779823. The next prime is 20779873. The reversal of 20779824 is 42897702.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (20779823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16027 + ... + 17274.

Almost surely, 2^20779824 is an apocalyptic number.

20779824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20779824 is an abundant number, since it is smaller than the sum of its proper divisors (37032448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20779824 is a wasteful number, since it uses less digits than its factorization.

20779824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33325 (or 33319 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 20779824 is about 4558.4892234160. The cubic root of 20779824 is about 274.9248235281.

The spelling of 20779824 in words is "twenty million, seven hundred seventy-nine thousand, eight hundred twenty-four".