20200023440 has 40 divisors (see below), whose sum is σ = 47024877120. Its totient is φ = 8069717376.

The previous prime is 20200023439. The next prime is 20200023443. The reversal of 20200023440 is 4432000202.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (20200023443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97460 + ... + 223379.

It is an arithmetic number, because the mean of its divisors is an integer number (1175621928).

Almost surely, 2^20200023440 is an apocalyptic number.

20200023440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20200023440 is an abundant number, since it is smaller than the sum of its proper divisors (26824853680).

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

20200023440 is a wasteful number, since it uses less digits than its factorization.

20200023440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321639 (or 321633 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

Adding to 20200023440 its reverse (4432000202), we get a palindrome (24632023642).

The spelling of 20200023440 in words is "twenty billion, two hundred million, twenty-three thousand, four hundred forty".