20438334280 has 64 divisors (see below), whose sum is σ = 56598474240. Its totient is φ = 6468394752.

The previous prime is 20438334271. The next prime is 20438334283. The reversal of 20438334280 is 8243383402.

It is not an unprimeable number, because it can be changed into a prime (20438334283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2803824 + ... + 2811103.

It is an arithmetic number, because the mean of its divisors is an integer number (884351160).

Almost surely, 2^20438334280 is an apocalyptic number.

20438334280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20438334280 is an abundant number, since it is smaller than the sum of its proper divisors (36160139960).

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

20438334280 is a wasteful number, since it uses less digits than its factorization.

20438334280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5614958 (or 5614954 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

The spelling of 20438334280 in words is "twenty billion, four hundred thirty-eight million, three hundred thirty-four thousand, two hundred eighty".