20667240 has 192 divisors, whose sum is σ = 77837760. Its totient is φ = 4700160.

The previous prime is 20667233. The next prime is 20667277. The reversal of 20667240 is 4276602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67167 + ... + 67473.

It is an arithmetic number, because the mean of its divisors is an integer number (405405).

Almost surely, 2^20667240 is an apocalyptic number.

20667240 is a gapful number since it is divisible by the number (20) 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 20667240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38918880).

20667240 is an abundant number, since it is smaller than the sum of its proper divisors (57170520).

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

20667240 is a wasteful number, since it uses less digits than its factorization.

20667240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352 (or 345 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20667240 is about 4546.1236234841. The cubic root of 20667240 is about 274.4274146919.

The spelling of 20667240 in words is "twenty million, six hundred sixty-seven thousand, two hundred forty".