20061000 has 128 divisors (see below), whose sum is σ = 69638400. Its totient is φ = 5342400.

The previous prime is 20060981. The next prime is 20061007. The reversal of 20061000 is 16002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20061007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26629 + ... + 27371.

It is an arithmetic number, because the mean of its divisors is an integer number (544050).

Almost surely, 2^20061000 is an apocalyptic number.

20061000 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 20061000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34819200).

20061000 is an abundant number, since it is smaller than the sum of its proper divisors (49577400).

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

20061000 is a wasteful number, since it uses less digits than its factorization.

20061000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20061000 is about 4478.9507699907. The cubic root of 20061000 is about 271.7174473597.

Adding to 20061000 its reverse (16002), we get a palindrome (20077002).

The spelling of 20061000 in words is "twenty million, sixty-one thousand".