20777741244 has 144 divisors (see below), whose sum is σ = 60680212320. Its totient is φ = 6172588800.

The previous prime is 20777741233. The next prime is 20777741291. The reversal of 20777741244 is 44214777702.

It is a self number, because there is not a number n which added to its sum of digits gives 20777741244.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 338094 + ... + 394794.

Almost surely, 2^20777741244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20777741244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30340106160).

20777741244 is an abundant number, since it is smaller than the sum of its proper divisors (39902471076).

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

20777741244 is a wasteful number, since it uses less digits than its factorization.

20777741244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56762 (or 56748 counting only the distinct ones).

The product of its (nonzero) digits is 614656, while the sum is 45.

The spelling of 20777741244 in words is "twenty billion, seven hundred seventy-seven million, seven hundred forty-one thousand, two hundred forty-four".