20438240280 has 32 divisors (see below), whose sum is σ = 61314721200. Its totient is φ = 5450197376.

The previous prime is 20438240213. The next prime is 20438240287. The reversal of 20438240280 is 8204283402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20438240287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85159215 + ... + 85159454.

Almost surely, 2^20438240280 is an apocalyptic number.

20438240280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20438240280 is an abundant number, since it is smaller than the sum of its proper divisors (40876480920).

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

20438240280 is a wasteful number, since it uses less digits than its factorization.

20438240280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170318683 (or 170318679 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 33.

The spelling of 20438240280 in words is "twenty billion, four hundred thirty-eight million, two hundred forty thousand, two hundred eighty".