20908661200 has 120 divisors (see below), whose sum is σ = 57918132288. Its totient is φ = 7105136640.

The previous prime is 20908661117. The next prime is 20908661203. The reversal of 20908661200 is 216680902.

It is a happy number.

It is a super-2 number, since 2×20908661200² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20908661203) 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, 283359 + ... + 349441.

Almost surely, 2^20908661200 is an apocalyptic number.

20908661200 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 20908661200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28959066144).

20908661200 is an abundant number, since it is smaller than the sum of its proper divisors (37009471088).

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

20908661200 is a wasteful number, since it uses less digits than its factorization.

20908661200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66221 (or 66210 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 20908661200 in words is "twenty billion, nine hundred eight million, six hundred sixty-one thousand, two hundred".