20165103640 has 32 divisors (see below), whose sum is σ = 49496164560. Its totient is φ = 7332764800.

The previous prime is 20165103631. The next prime is 20165103649. The reversal of 20165103640 is 4630156102.

It is an interprime number because it is at equal distance from previous prime (20165103631) and next prime (20165103649).

It is a junction number, because it is equal to n+sod(n) for n = 20165103599 and 20165103608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20165103649) 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, 22914451 + ... + 22915330.

Almost surely, 2^20165103640 is an apocalyptic number.

20165103640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20165103640 is an abundant number, since it is smaller than the sum of its proper divisors (29331060920).

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

20165103640 is a wasteful number, since it uses less digits than its factorization.

20165103640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45829803 (or 45829799 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 20165103640 its reverse (4630156102), we get a palindrome (24795259742).

The spelling of 20165103640 in words is "twenty billion, one hundred sixty-five million, one hundred three thousand, six hundred forty".