20673900 has 288 divisors, whose sum is σ = 77772800. Its totient is φ = 4665600.

The previous prime is 20673893. The next prime is 20673907. The reversal of 20673900 is 937602.

It is an interprime number because it is at equal distance from previous prime (20673893) and next prime (20673907).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20673907) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 666885 + ... + 666915.

Almost surely, 2^20673900 is an apocalyptic number.

20673900 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 20673900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38886400).

20673900 is an abundant number, since it is smaller than the sum of its proper divisors (57098900).

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

20673900 is a wasteful number, since it uses less digits than its factorization.

20673900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 20673900 is about 4546.8560566616. The cubic root of 20673900 is about 274.4568895241.

The spelling of 20673900 in words is "twenty million, six hundred seventy-three thousand, nine hundred".