20155204120 has 32 divisors (see below), whose sum is σ = 45695398320. Its totient is φ = 8000536960.

The previous prime is 20155204067. The next prime is 20155204127. The reversal of 20155204120 is 2140255102.

It is a junction number, because it is equal to n+sod(n) for n = 20155204091 and 20155204100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155204127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1917967 + ... + 1928446.

Almost surely, 2^20155204120 is an apocalyptic number.

20155204120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20155204120 is an abundant number, since it is smaller than the sum of its proper divisors (25540194200).

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

20155204120 is a wasteful number, since it uses less digits than its factorization.

20155204120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846555 (or 3846551 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 20155204120 its reverse (2140255102), we get a palindrome (22295459222).

The spelling of 20155204120 in words is "twenty billion, one hundred fifty-five million, two hundred four thousand, one hundred twenty".