20356721026 has 16 divisors (see below), whose sum is σ = 32336194680. Its totient is φ = 9578172160.

The previous prime is 20356720999. The next prime is 20356721039. The reversal of 20356721026 is 62012765302.

It can be written as a sum of positive squares in 4 ways, for example, as 20196673225 + 160047801 = 142115^2 + 12651^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 20356720982 and 20356721000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199596 + ... + 283816.

Almost surely, 2^20356721026 is an apocalyptic number.

20356721026 is a deficient number, since it is larger than the sum of its proper divisors (11979473654).

20356721026 is a wasteful number, since it uses less digits than its factorization.

20356721026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91349.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 20356721026 in words is "twenty billion, three hundred fifty-six million, seven hundred twenty-one thousand, twenty-six".