20440628756 has 6 divisors (see below), whose sum is σ = 35771100330. Its totient is φ = 10220314376.

The previous prime is 20440628753. The next prime is 20440628771. The reversal of 20440628756 is 65782604402.

It can be written as a sum of positive squares in only one way, i.e., 19878180100 + 562448656 = 140990^2 + 23716^2 .

It is a super-2 number, since 2×20440628756² (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 (20440628753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2555078591 + ... + 2555078598.

It is an arithmetic number, because the mean of its divisors is an integer number (5961850055).

Almost surely, 2^20440628756 is an apocalyptic number.

It is an amenable number.

20440628756 is a deficient number, since it is larger than the sum of its proper divisors (15330471574).

20440628756 is a wasteful number, since it uses less digits than its factorization.

20440628756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5110157193 (or 5110157191 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 44.

The spelling of 20440628756 in words is "twenty billion, four hundred forty million, six hundred twenty-eight thousand, seven hundred fifty-six".