20211450616 has 64 divisors (see below), whose sum is σ = 44919000000. Its totient is φ = 8519978880.

The previous prime is 20211450593. The next prime is 20211450641. The reversal of 20211450616 is 61605411202.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107010 + ... + 227758.

It is an arithmetic number, because the mean of its divisors is an integer number (701859375).

Almost surely, 2^20211450616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20211450616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22459500000).

20211450616 is an abundant number, since it is smaller than the sum of its proper divisors (24707549384).

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

20211450616 is a wasteful number, since it uses less digits than its factorization.

20211450616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120837 (or 120819 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 20211450616 its reverse (61605411202), we get a palindrome (81816861818).

The spelling of 20211450616 in words is "twenty billion, two hundred eleven million, four hundred fifty thousand, six hundred sixteen".