20669004 has 36 divisors (see below), whose sum is σ = 52841880. Its totient is φ = 6811200.

The previous prime is 20668997. The next prime is 20669009. The reversal of 20669004 is 40096602.

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

It is not an unprimeable number, because it can be changed into a prime (20669009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22 + ... + 6429.

It is an arithmetic number, because the mean of its divisors is an integer number (1467830).

Almost surely, 2^20669004 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 20669004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26420940).

20669004 is an abundant number, since it is smaller than the sum of its proper divisors (32172876).

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

20669004 is a wasteful number, since it uses less digits than its factorization.

20669004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6550 (or 6545 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20669004 is about 4546.3176307865. The cubic root of 20669004 is about 274.4352221558.

The spelling of 20669004 in words is "twenty million, six hundred sixty-nine thousand, four".