20789491000 has 128 divisors (see below), whose sum is σ = 50444596800. Its totient is φ = 8009971200.

The previous prime is 20789490989. The next prime is 20789491001. The reversal of 20789491000 is 19498702.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20789491001) 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, 21952527 + ... + 21953473.

Almost surely, 2^20789491000 is an apocalyptic number.

20789491000 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 20789491000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25222298400).

20789491000 is an abundant number, since it is smaller than the sum of its proper divisors (29655105800).

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

20789491000 is a wasteful number, since it uses less digits than its factorization.

20789491000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754 (or 1740 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 20789491000 in words is "twenty billion, seven hundred eighty-nine million, four hundred ninety-one thousand".