20021440434 has 16 divisors (see below), whose sum is σ = 40190643840. Its totient is φ = 6649186320.

The previous prime is 20021440403. The next prime is 20021440441. The reversal of 20021440434 is 43404412002.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6155029 + ... + 6158280.

It is an arithmetic number, because the mean of its divisors is an integer number (2511915240).

Almost surely, 2^20021440434 is an apocalyptic number.

20021440434 is an abundant number, since it is smaller than the sum of its proper divisors (20169203406).

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

20021440434 is a wasteful number, since it uses less digits than its factorization.

20021440434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12313585.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20021440434 its reverse (43404412002), we get a palindrome (63425852436).

The spelling of 20021440434 in words is "twenty billion, twenty-one million, four hundred forty thousand, four hundred thirty-four".