20377557221 has 16 divisors (see below), whose sum is σ = 23467267200. Its totient is φ = 17332729920.

The previous prime is 20377557217. The next prime is 20377557253. The reversal of 20377557221 is 12275577302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20377557221 - 2² = 20377557217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20377557121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1156286 + ... + 1173776.

It is an arithmetic number, because the mean of its divisors is an integer number (1466704200).

Almost surely, 2^20377557221 is an apocalyptic number.

It is an amenable number.

20377557221 is a deficient number, since it is larger than the sum of its proper divisors (3089709979).

20377557221 is a wasteful number, since it uses less digits than its factorization.

20377557221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18764.

The product of its (nonzero) digits is 205800, while the sum is 41.

The spelling of 20377557221 in words is "twenty billion, three hundred seventy-seven million, five hundred fifty-seven thousand, two hundred twenty-one".