20434212140340 has 48 divisors (see below), whose sum is σ = 57216156181632. Its totient is φ = 5449088743296.

The previous prime is 20434212140311. The next prime is 20434212140357. The reversal of 20434212140340 is 4304121243402.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20434212140298 and 20434212140307.

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, 9306097 + ... + 11290343.

It is an arithmetic number, because the mean of its divisors is an integer number (1192003253784).

Almost surely, 2^{20434212140340} is an apocalyptic number.

20434212140340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20434212140340 is an abundant number, since it is smaller than the sum of its proper divisors (36781944041292).

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

20434212140340 is a wasteful number, since it uses less digits than its factorization.

20434212140340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155896 (or 2155894 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 20434212140340 its reverse (4304121243402), we get a palindrome (24738333383742).

The spelling of 20434212140340 in words is "twenty trillion, four hundred thirty-four billion, two hundred twelve million, one hundred forty thousand, three hundred forty".