20643321626 has 32 divisors (see below), whose sum is σ = 31828749120. Its totient is φ = 10038036096.

The previous prime is 20643321619. The next prime is 20643321637. The reversal of 20643321626 is 62612334602.

It is a super-2 number, since 2×20643321626² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14465525 + ... + 14466951.

It is an arithmetic number, because the mean of its divisors is an integer number (994648410).

Almost surely, 2^20643321626 is an apocalyptic number.

20643321626 is a deficient number, since it is larger than the sum of its proper divisors (11185427494).

20643321626 is a wasteful number, since it uses less digits than its factorization.

20643321626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798.

The product of its (nonzero) digits is 62208, while the sum is 35.

The spelling of 20643321626 in words is "twenty billion, six hundred forty-three million, three hundred twenty-one thousand, six hundred twenty-six".