20336503440 has 320 divisors, whose sum is σ = 71419428864. Its totient is φ = 4742400000.

The previous prime is 20336503427. The next prime is 20336503459. The reversal of 20336503440 is 4430563302.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20336503398 and 20336503407.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15630790 + ... + 15632090.

Almost surely, 2^20336503440 is an apocalyptic number.

20336503440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20336503440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35709714432).

20336503440 is an abundant number, since it is smaller than the sum of its proper divisors (51082925424).

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

20336503440 is a wasteful number, since it uses less digits than its factorization.

20336503440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550 (or 1544 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 30.

It can be divided in two parts, 20336 and 503440, that added together give a triangular number (523776 = T₁₀₂₃).

The spelling of 20336503440 in words is "twenty billion, three hundred thirty-six million, five hundred three thousand, four hundred forty".