20261020636 has 24 divisors (see below), whose sum is σ = 36770988240. Its totient is φ = 9756768000.

The previous prime is 20261020621. The next prime is 20261020669. The reversal of 20261020636 is 63602016202.

It is a happy number.

It is a congruent number.

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, 171270 + ... + 264301.

It is an arithmetic number, because the mean of its divisors is an integer number (1532124510).

Almost surely, 2^20261020636 is an apocalyptic number.

It is an amenable number.

20261020636 is a deficient number, since it is larger than the sum of its proper divisors (16509967604).

20261020636 is a wasteful number, since it uses less digits than its factorization.

20261020636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436005 (or 436003 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 20261020636 its reverse (63602016202), we get a palindrome (83863036838).

The spelling of 20261020636 in words is "twenty billion, two hundred sixty-one million, twenty thousand, six hundred thirty-six".