20667960 has 80 divisors (see below), whose sum is σ = 69478200. Its totient is φ = 5510592.

The previous prime is 20667943. The next prime is 20667967. The reversal of 20667960 is 6976602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20667967) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 51 + ... + 6429.

Almost surely, 2^20667960 is an apocalyptic number.

20667960 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 20667960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34739100).

20667960 is an abundant number, since it is smaller than the sum of its proper divisors (48810240).

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

20667960 is a wasteful number, since it uses less digits than its factorization.

20667960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6402 (or 6389 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 20667960 is about 4546.2028111381. The cubic root of 20667960 is about 274.4306014655.

The spelling of 20667960 in words is "twenty million, six hundred sixty-seven thousand, nine hundred sixty".