20204243440 has 40 divisors (see below), whose sum is σ = 47974340160. Its totient is φ = 7909744896.

The previous prime is 20204243431. The next prime is 20204243513. The reversal of 20204243440 is 4434240202.

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

It is a super-2 number, since 2×20204243440² (a number of 21 digits) contains 22 as substring.

It is a congruent 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, 2682975 + ... + 2690494.

It is an arithmetic number, because the mean of its divisors is an integer number (1199358504).

Almost surely, 2^20204243440 is an apocalyptic number.

20204243440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20204243440 is an abundant number, since it is smaller than the sum of its proper divisors (27770096720).

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

20204243440 is a wasteful number, since it uses less digits than its factorization.

20204243440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5373529 (or 5373523 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 25.

Adding to 20204243440 its reverse (4434240202), we get a palindrome (24638483642).

The spelling of 20204243440 in words is "twenty billion, two hundred four million, two hundred forty-three thousand, four hundred forty".