20247739776 has 768 divisors, whose sum is σ = 71856046080. Its totient is φ = 5611161600.

The previous prime is 20247739727. The next prime is 20247739849. The reversal of 20247739776 is 67793774202.

20247739776 is a `hidden beast` number, since 2 + 0 + 247 + 7 + 397 + 7 + 6 = 666.

It is a super-2 number, since 2×20247739776² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a zygodrome in base 8.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 243948631 + ... + 243948713.

It is an arithmetic number, because the mean of its divisors is an integer number (93562560).

Almost surely, 2^20247739776 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 20247739776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35928023040).

20247739776 is an abundant number, since it is smaller than the sum of its proper divisors (51608306304).

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

20247739776 is a wasteful number, since it uses less digits than its factorization.

20247739776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 6223392, while the sum is 54.

The spelling of 20247739776 in words is "twenty billion, two hundred forty-seven million, seven hundred thirty-nine thousand, seven hundred seventy-six".