20550286440 has 96 divisors (see below), whose sum is σ = 69262109280. Its totient is φ = 5480073792.

The previous prime is 20550286423. The next prime is 20550286441. The reversal of 20550286440 is 4468205502.

It is a happy number.

20550286440 is a `hidden beast` number, since 2 + 0 + 5 + 5 + 0 + 2 + 8 + 644 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20550286395 and 20550286404.

It is not an unprimeable number, because it can be changed into a prime (20550286441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1047394 + ... + 1066833.

It is an arithmetic number, because the mean of its divisors is an integer number (721480305).

Almost surely, 2^20550286440 is an apocalyptic number.

20550286440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20550286440 is an abundant number, since it is smaller than the sum of its proper divisors (48711822840).

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

20550286440 is a wasteful number, since it uses less digits than its factorization.

20550286440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114253 (or 2114237 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The spelling of 20550286440 in words is "twenty billion, five hundred fifty million, two hundred eighty-six thousand, four hundred forty".