20340135424 has 160 divisors (see below), whose sum is σ = 47950056000. Its totient is φ = 8438415360.

The previous prime is 20340135419. The next prime is 20340135511. The reversal of 20340135424 is 42453104302.

It is a happy number.

It is a super-2 number, since 2×20340135424² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 20340135392 and 20340135401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21894192 + ... + 21895120.

It is an arithmetic number, because the mean of its divisors is an integer number (299687850).

Almost surely, 2^20340135424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20340135424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23975028000).

20340135424 is an abundant number, since it is smaller than the sum of its proper divisors (27609920576).

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

20340135424 is an equidigital number, since it uses as much as digits as its factorization.

20340135424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144 (or 1128 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 20340135424 its reverse (42453104302), we get a palindrome (62793239726).

The spelling of 20340135424 in words is "twenty billion, three hundred forty million, one hundred thirty-five thousand, four hundred twenty-four".