20431547444 has 216 divisors, whose sum is σ = 48777692544. Its totient is φ = 7464441600.

The previous prime is 20431547377. The next prime is 20431547489. The reversal of 20431547444 is 44474513402.

It is a super-3 number, since 3×20431547444³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20431547398 and 20431547407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 75393029 + ... + 75393299.

Almost surely, 2^20431547444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20431547444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24388846272).

20431547444 is an abundant number, since it is smaller than the sum of its proper divisors (28346145100).

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

20431547444 is a wasteful number, since it uses less digits than its factorization.

20431547444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 38.

The spelling of 20431547444 in words is "twenty billion, four hundred thirty-one million, five hundred forty-seven thousand, four hundred forty-four".