20407747368 has 64 divisors (see below), whose sum is σ = 52274280960. Its totient is φ = 6635676096.

The previous prime is 20407747363. The next prime is 20407747391. The reversal of 20407747368 is 86374770402.

It is a super-2 number, since 2×20407747368² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20407747363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 799621 + ... + 824747.

It is an arithmetic number, because the mean of its divisors is an integer number (816785640).

Almost surely, 2^20407747368 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 20407747368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26137140480).

20407747368 is an abundant number, since it is smaller than the sum of its proper divisors (31866533592).

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

20407747368 is a wasteful number, since it uses less digits than its factorization.

20407747368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25966 (or 25962 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 48.

The spelling of 20407747368 in words is "twenty billion, four hundred seven million, seven hundred forty-seven thousand, three hundred sixty-eight".