20011433240 has 32 divisors (see below), whose sum is σ = 45039834000. Its totient is φ = 8002065024.

The previous prime is 20011433201. The next prime is 20011433249. The reversal of 20011433240 is 4233411002.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011433249) 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, 53606 + ... + 207114.

Almost surely, 2^20011433240 is an apocalyptic number.

20011433240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011433240 is an abundant number, since it is smaller than the sum of its proper divisors (25028400760).

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

20011433240 is a wasteful number, since it uses less digits than its factorization.

20011433240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156779 (or 156775 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20011433240 its reverse (4233411002), we get a palindrome (24244844242).

The spelling of 20011433240 in words is "twenty billion, eleven million, four hundred thirty-three thousand, two hundred forty".