20420033240 has 32 divisors (see below), whose sum is σ = 45951263280. Its totient is φ = 8166913152.

The previous prime is 20420033239. The next prime is 20420033269. The reversal of 20420033240 is 4233002402.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 308534 + ... + 368826.

Almost surely, 2^20420033240 is an apocalyptic number.

20420033240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20420033240 is an abundant number, since it is smaller than the sum of its proper divisors (25531230040).

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

20420033240 is a wasteful number, since it uses less digits than its factorization.

20420033240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68771 (or 68767 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

Adding to 20420033240 its reverse (4233002402), we get a palindrome (24653035642).

The spelling of 20420033240 in words is "twenty billion, four hundred twenty million, thirty-three thousand, two hundred forty".