20211433440 has 144 divisors (see below), whose sum is σ = 69980201424. Its totient is φ = 4899727360.

The previous prime is 20211433439. The next prime is 20211433457. The reversal of 20211433440 is 4433411202.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20211433440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115917 + ... + 232076.

It is an arithmetic number, because the mean of its divisors is an integer number (485973621).

Almost surely, 2^20211433440 is an apocalyptic number.

20211433440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211433440 is an abundant number, since it is smaller than the sum of its proper divisors (49768767984).

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

20211433440 is a wasteful number, since it uses less digits than its factorization.

20211433440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348033 (or 348014 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 20211433440 its reverse (4433411202), we get a palindrome (24644844642).

The spelling of 20211433440 in words is "twenty billion, two hundred eleven million, four hundred thirty-three thousand, four hundred forty".