20648949100 has 72 divisors (see below), whose sum is σ = 48698046320. Its totient is φ = 7554228480.

The previous prime is 20648949053. The next prime is 20648949109. The reversal of 20648949100 is 194984602.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20648949109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68839 + ... + 214561.

Almost surely, 2^20648949100 is an apocalyptic number.

20648949100 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 20648949100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24349023160).

20648949100 is an abundant number, since it is smaller than the sum of its proper divisors (28049097220).

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

20648949100 is a wasteful number, since it uses less digits than its factorization.

20648949100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145859 (or 145852 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 20648949100 in words is "twenty billion, six hundred forty-eight million, nine hundred forty-nine thousand, one hundred".