20451265738 has 8 divisors (see below), whose sum is σ = 30678505920. Its totient is φ = 10225097100.

The previous prime is 20451265729. The next prime is 20451265739. The reversal of 20451265738 is 83756215402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20451265694 and 20451265703.

It is not an unprimeable number, because it can be changed into a prime (20451265739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218338 + ... + 297613.

It is an arithmetic number, because the mean of its divisors is an integer number (3834813240).

Almost surely, 2^20451265738 is an apocalyptic number.

20451265738 is a deficient number, since it is larger than the sum of its proper divisors (10227240182).

20451265738 is a wasteful number, since it uses less digits than its factorization.

20451265738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535772.

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 20451265738 in words is "twenty billion, four hundred fifty-one million, two hundred sixty-five thousand, seven hundred thirty-eight".