20211023016 has 64 divisors (see below), whose sum is σ = 56932502400. Its totient is φ = 6642115200.

The previous prime is 20211023011. The next prime is 20211023023. The reversal of 20211023016 is 61032011202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 20211023016.

It is not an unprimeable number, because it can be changed into a prime (20211023011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 643605 + ... + 674276.

It is an arithmetic number, because the mean of its divisors is an integer number (889570350).

Almost surely, 2^20211023016 is an apocalyptic number.

It is an amenable number.

20211023016 is an abundant number, since it is smaller than the sum of its proper divisors (36721479384).

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

20211023016 is a wasteful number, since it uses less digits than its factorization.

20211023016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317967 (or 1317957 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20211023016 its reverse (61032011202), we get a palindrome (81243034218).

The spelling of 20211023016 in words is "twenty billion, two hundred eleven million, twenty-three thousand, sixteen".