20155481000 has 32 divisors (see below), whose sum is σ = 47163827880. Its totient is φ = 8062192000.

The previous prime is 20155480979. The next prime is 20155481011. The reversal of 20155481000 is 18455102.

It can be written as a sum of positive squares in 4 ways, for example, as 7254610276 + 12900870724 = 85174^2 + 113582^2 .

It is a super-2 number, since 2×20155481000² (a number of 21 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 10076741 + ... + 10078740.

Almost surely, 2^20155481000 is an apocalyptic number.

20155481000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20155481000 is an abundant number, since it is smaller than the sum of its proper divisors (27008346880).

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

20155481000 is a wasteful number, since it uses less digits than its factorization.

20155481000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20155502 (or 20155488 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The spelling of 20155481000 in words is "twenty billion, one hundred fifty-five million, four hundred eighty-one thousand".