20155845400 has 48 divisors (see below), whose sum is σ = 46891195200. Its totient is φ = 8057374080.

The previous prime is 20155845389. The next prime is 20155845401. The reversal of 20155845400 is 454855102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155845401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 303609 + ... + 363991.

It is an arithmetic number, because the mean of its divisors is an integer number (976899900).

Almost surely, 2^20155845400 is an apocalyptic number.

20155845400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20155845400 is an abundant number, since it is smaller than the sum of its proper divisors (26735349800).

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

20155845400 is a wasteful number, since it uses less digits than its factorization.

20155845400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62068 (or 62059 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 34.

The spelling of 20155845400 in words is "twenty billion, one hundred fifty-five million, eight hundred forty-five thousand, four hundred".