20404043544 has 32 divisors (see below), whose sum is σ = 53227941120. Its totient is φ = 6505636896.

The previous prime is 20404043507. The next prime is 20404043581. The reversal of 20404043544 is 44534040402.

It is an interprime number because it is at equal distance from previous prime (20404043507) and next prime (20404043581).

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, 18481372 + ... + 18482475.

It is an arithmetic number, because the mean of its divisors is an integer number (1663373160).

Almost surely, 2^20404043544 is an apocalyptic number.

20404043544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20404043544 is an abundant number, since it is smaller than the sum of its proper divisors (32823897576).

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

20404043544 is a wasteful number, since it uses less digits than its factorization.

20404043544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36963879 (or 36963875 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 30.

Adding to 20404043544 its reverse (44534040402), we get a palindrome (64938083946).

The spelling of 20404043544 in words is "twenty billion, four hundred four million, forty-three thousand, five hundred forty-four".