20036351647 has 4 divisors (see below), whose sum is σ = 21577609480. Its totient is φ = 18495093816.

The previous prime is 20036351617. The next prime is 20036351653. The reversal of 20036351647 is 74615363002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20036351647 - 2¹⁹ = 20035827359 is a prime.

It is a super-2 number, since 2×20036351647² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20036351617) 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, 770628897 + ... + 770628922.

It is an arithmetic number, because the mean of its divisors is an integer number (5394402370).

Almost surely, 2^20036351647 is an apocalyptic number.

20036351647 is a deficient number, since it is larger than the sum of its proper divisors (1541257833).

20036351647 is a wasteful number, since it uses less digits than its factorization.

20036351647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541257832.

The product of its (nonzero) digits is 90720, while the sum is 37.

The spelling of 20036351647 in words is "twenty billion, thirty-six million, three hundred fifty-one thousand, six hundred forty-seven".