20643649322 has 8 divisors (see below), whose sum is σ = 31720729572. Its totient is φ = 10070072800.

The previous prime is 20643649309. The next prime is 20643649373. The reversal of 20643649322 is 22394634602.

It can be written as a sum of positive squares in 2 ways, for example, as 19881282001 + 762367321 = 141001^2 + 27611^2 .

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

It is a super-2 number, since 2×20643649322² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a self number, because there is not a number n which added to its sum of digits gives 20643649322.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125875829 + ... + 125875992.

Almost surely, 2^20643649322 is an apocalyptic number.

20643649322 is a deficient number, since it is larger than the sum of its proper divisors (11077080250).

20643649322 is a wasteful number, since it uses less digits than its factorization.

20643649322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251751864.

The product of its (nonzero) digits is 373248, while the sum is 41.

The spelling of 20643649322 in words is "twenty billion, six hundred forty-three million, six hundred forty-nine thousand, three hundred twenty-two".