20152102340 has 24 divisors (see below), whose sum is σ = 42343629720. Its totient is φ = 8056228608.

The previous prime is 20152102319. The next prime is 20152102343. The reversal of 20152102340 is 4320125102.

It can be written as a sum of positive squares in 4 ways, for example, as 2863534144 + 17288568196 = 53512^2 + 131486^2 .

It is a super-2 number, since 2×20152102340² (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 not an unprimeable number, because it can be changed into a prime (20152102343) 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, 252335 + ... + 322454.

It is an arithmetic number, because the mean of its divisors is an integer number (1764317905).

Almost surely, 2^20152102340 is an apocalyptic number.

20152102340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20152102340 is an abundant number, since it is smaller than the sum of its proper divisors (22191527380).

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

20152102340 is a wasteful number, since it uses less digits than its factorization.

20152102340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576551 (or 576549 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 20152102340 its reverse (4320125102), we get a palindrome (24472227442).

The spelling of 20152102340 in words is "twenty billion, one hundred fifty-two million, one hundred two thousand, three hundred forty".