20361221688 has 32 divisors (see below), whose sum is σ = 50958984960. Its totient is φ = 6779616480.

The previous prime is 20361221653. The next prime is 20361221689. The reversal of 20361221688 is 88612216302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20361221689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443770 + ... + 487497.

It is an arithmetic number, because the mean of its divisors is an integer number (1592468280).

Almost surely, 2^20361221688 is an apocalyptic number.

It is an amenable number.

20361221688 is an abundant number, since it is smaller than the sum of its proper divisors (30597763272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20361221688 is a wasteful number, since it uses less digits than its factorization.

20361221688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932187 (or 932183 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The spelling of 20361221688 in words is "twenty billion, three hundred sixty-one million, two hundred twenty-one thousand, six hundred eighty-eight".