20550404040 has 32 divisors (see below), whose sum is σ = 61651212480. Its totient is φ = 5480107712.

The previous prime is 20550404023. The next prime is 20550404071. The reversal of 20550404040 is 4040405502.

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 20550404040.

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, 85626564 + ... + 85626803.

It is an arithmetic number, because the mean of its divisors is an integer number (1926600390).

Almost surely, 2^20550404040 is an apocalyptic number.

20550404040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20550404040 is an abundant number, since it is smaller than the sum of its proper divisors (41100808440).

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

20550404040 is a wasteful number, since it uses less digits than its factorization.

20550404040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171253381 (or 171253377 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

Adding to 20550404040 its reverse (4040405502), we get a palindrome (24590809542).

The spelling of 20550404040 in words is "twenty billion, five hundred fifty million, four hundred four thousand, forty".