20424321240 has 32 divisors (see below), whose sum is σ = 61272964080. Its totient is φ = 5446485632.

The previous prime is 20424321221. The next prime is 20424321277. The reversal of 20424321240 is 4212342402.

It is a super-2 number, since 2×20424321240² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20424321240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85101219 + ... + 85101458.

Almost surely, 2^20424321240 is an apocalyptic number.

20424321240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20424321240 is an abundant number, since it is smaller than the sum of its proper divisors (40848642840).

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

20424321240 is a wasteful number, since it uses less digits than its factorization.

20424321240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170202691 (or 170202687 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20424321240 its reverse (4212342402), we get a palindrome (24636663642).

The spelling of 20424321240 in words is "twenty billion, four hundred twenty-four million, three hundred twenty-one thousand, two hundred forty".