20667744 has 96 divisors (see below), whose sum is σ = 63504000. Its totient is φ = 6521472.

The previous prime is 20667737. The next prime is 20667811. The reversal of 20667744 is 44776602.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20667699 and 20667708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15787 + ... + 17045.

It is an arithmetic number, because the mean of its divisors is an integer number (661500).

Almost surely, 2^20667744 is an apocalyptic number.

20667744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20667744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31752000).

20667744 is an abundant number, since it is smaller than the sum of its proper divisors (42836256).

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

20667744 is a wasteful number, since it uses less digits than its factorization.

20667744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297 (or 1283 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The square root of 20667744 is about 4546.1790549867. The cubic root of 20667744 is about 274.4296454412.

The spelling of 20667744 in words is "twenty million, six hundred sixty-seven thousand, seven hundred forty-four".