20155616440 has 16 divisors (see below), whose sum is σ = 45350137080. Its totient is φ = 8062246560.

The previous prime is 20155616413. The next prime is 20155616443. The reversal of 20155616440 is 4461655102.

It is a super-3 number, since 3×20155616440³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20155616396 and 20155616405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155616443) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 251945166 + ... + 251945245.

Almost surely, 2^20155616440 is an apocalyptic number.

20155616440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20155616440 is an abundant number, since it is smaller than the sum of its proper divisors (25194520640).

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

20155616440 is a wasteful number, since it uses less digits than its factorization.

20155616440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503890422 (or 503890418 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 20155616440 in words is "twenty billion, one hundred fifty-five million, six hundred sixteen thousand, four hundred forty".