20281477439 has 12 divisors (see below), whose sum is σ = 22088734200. Its totient is φ = 18548420688.

The previous prime is 20281477429. The next prime is 20281477483. The reversal of 20281477439 is 93477418202.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20281477439 is a prime.

It is a super-3 number, since 3×20281477439³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20281477393 and 20281477402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20281477429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3339884 + ... + 3345950.

It is an arithmetic number, because the mean of its divisors is an integer number (1840727850).

Almost surely, 2^20281477439 is an apocalyptic number.

20281477439 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20281477439 is a deficient number, since it is larger than the sum of its proper divisors (1807256761).

20281477439 is an frugal number, since it uses more digits than its factorization.

20281477439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12182 (or 6115 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 20281477439 in words is "twenty billion, two hundred eighty-one million, four hundred seventy-seven thousand, four hundred thirty-nine".