20223431646 has 64 divisors (see below), whose sum is σ = 45280892160. Its totient is φ = 5969283840.

The previous prime is 20223431633. The next prime is 20223431729. The reversal of 20223431646 is 64613432202.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 465426 + ... + 507018.

It is an arithmetic number, because the mean of its divisors is an integer number (707513940).

Almost surely, 2^20223431646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20223431646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22640446080).

20223431646 is an abundant number, since it is smaller than the sum of its proper divisors (25057460514).

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

20223431646 is a wasteful number, since it uses less digits than its factorization.

20223431646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41801.

The product of its (nonzero) digits is 41472, while the sum is 33.

Adding to 20223431646 its reverse (64613432202), we get a palindrome (84836863848).

The spelling of 20223431646 in words is "twenty billion, two hundred twenty-three million, four hundred thirty-one thousand, six hundred forty-six".