20533242440 has 16 divisors (see below), whose sum is σ = 46199795580. Its totient is φ = 8213296960.

The previous prime is 20533242427. The next prime is 20533242451. The reversal of 20533242440 is 4424233502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18605505604 + 1927736836 = 136402^2 + 43906^2 .

It is a super-2 number, since 2×20533242440² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256665491 + ... + 256665570.

Almost surely, 2^20533242440 is an apocalyptic number.

20533242440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20533242440 is an abundant number, since it is smaller than the sum of its proper divisors (25666553140).

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

20533242440 is a wasteful number, since it uses less digits than its factorization.

20533242440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513331072 (or 513331068 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 29.

Adding to 20533242440 its reverse (4424233502), we get a palindrome (24957475942).

The spelling of 20533242440 in words is "twenty billion, five hundred thirty-three million, two hundred forty-two thousand, four hundred forty".