20211323240 has 16 divisors (see below), whose sum is σ = 45475477380. Its totient is φ = 8084529280.

The previous prime is 20211323173. The next prime is 20211323263. The reversal of 20211323240 is 4232311202.

It can be written as a sum of positive squares in 2 ways, for example, as 19952692516 + 258630724 = 141254^2 + 16082^2 .

It is a super-2 number, since 2×20211323240² (a number of 21 digits) contains 22 as substring.

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

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, 252641501 + ... + 252641580.

Almost surely, 2^20211323240 is an apocalyptic number.

20211323240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211323240 is an abundant number, since it is smaller than the sum of its proper divisors (25264154140).

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

20211323240 is a wasteful number, since it uses less digits than its factorization.

20211323240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505283092 (or 505283088 counting only the distinct ones).

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

Adding to 20211323240 its reverse (4232311202), we get a palindrome (24443634442).

The spelling of 20211323240 in words is "twenty billion, two hundred eleven million, three hundred twenty-three thousand, two hundred forty".