20438889630 has 16 divisors (see below), whose sum is σ = 49053335184. Its totient is φ = 5450370560.

The previous prime is 20438889607. The next prime is 20438889637. The reversal of 20438889630 is 3698883402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20438889637) 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, 340648131 + ... + 340648190.

It is an arithmetic number, because the mean of its divisors is an integer number (3065833449).

Almost surely, 2^20438889630 is an apocalyptic number.

20438889630 is an abundant number, since it is smaller than the sum of its proper divisors (28614445554).

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

20438889630 is a wasteful number, since it uses less digits than its factorization.

20438889630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681296331.

The product of its (nonzero) digits is 1990656, while the sum is 51.

The spelling of 20438889630 in words is "twenty billion, four hundred thirty-eight million, eight hundred eighty-nine thousand, six hundred thirty".