20648004 has 48 divisors (see below), whose sum is σ = 52411968. Its totient is φ = 6288768.

The previous prime is 20647999. The next prime is 20648009. The reversal of 20648004 is 40084602.

It is an interprime number because it is at equal distance from previous prime (20647999) and next prime (20648009).

It is not an unprimeable number, because it can be changed into a prime (20648009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16074 + ... + 17310.

It is an arithmetic number, because the mean of its divisors is an integer number (1091916).

Almost surely, 2^20648004 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 20648004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26205984).

20648004 is an abundant number, since it is smaller than the sum of its proper divisors (31763964).

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

20648004 is a wasteful number, since it uses less digits than its factorization.

20648004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364 (or 1362 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 20648004 is about 4544.0074823882. The cubic root of 20648004 is about 274.3422473068.

The spelling of 20648004 in words is "twenty million, six hundred forty-eight thousand, four".