20667340 has 48 divisors (see below), whose sum is σ = 45722880. Its totient is φ = 7832000.

The previous prime is 20667331. The next prime is 20667373. The reversal of 20667340 is 4376602.

20667340 = T₁₅₉ + T₁₆₀ + ... + T₅₀₃.

It is a junction number, because it is equal to n+sod(n) for n = 20667299 and 20667308.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82215 + ... + 82465.

It is an arithmetic number, because the mean of its divisors is an integer number (952560).

Almost surely, 2^20667340 is an apocalyptic number.

20667340 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 20667340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22861440).

20667340 is an abundant number, since it is smaller than the sum of its proper divisors (25055540).

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

20667340 is a wasteful number, since it uses less digits than its factorization.

20667340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 20667340 is about 4546.1346218518. The cubic root of 20667340 is about 274.4278573038.

The spelling of 20667340 in words is "twenty million, six hundred sixty-seven thousand, three hundred forty".