20461172340 has 48 divisors (see below), whose sum is σ = 65475752832. Its totient is φ = 4676839296.

The previous prime is 20461172339. The next prime is 20461172353. The reversal of 20461172340 is 4327116402.

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 = 20461172298 and 20461172307.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24358119 + ... + 24358958.

It is an arithmetic number, because the mean of its divisors is an integer number (1364078184).

Almost surely, 2^20461172340 is an apocalyptic number.

20461172340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20461172340 is an abundant number, since it is smaller than the sum of its proper divisors (45014580492).

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

20461172340 is a wasteful number, since it uses less digits than its factorization.

20461172340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48717096 (or 48717094 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

Adding to 20461172340 its reverse (4327116402), we get a palindrome (24788288742).

The spelling of 20461172340 in words is "twenty billion, four hundred sixty-one million, one hundred seventy-two thousand, three hundred forty".