20667996 has 36 divisors (see below), whose sum is σ = 52881192. Its totient is φ = 6805344.

The previous prime is 20667973. The next prime is 20668027. The reversal of 20667996 is 69976602.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 471 + ... + 6446.

It is an arithmetic number, because the mean of its divisors is an integer number (1468922).

Almost surely, 2^20667996 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20667996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26440596).

20667996 is an abundant number, since it is smaller than the sum of its proper divisors (32213196).

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

20667996 is a wasteful number, since it uses less digits than its factorization.

20667996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7010 (or 7005 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 20667996 is about 4546.2067704846. The cubic root of 20667996 is about 274.4307608022.

The spelling of 20667996 in words is "twenty million, six hundred sixty-seven thousand, nine hundred ninety-six".