20107121500 has 24 divisors (see below), whose sum is σ = 43913954448. Its totient is φ = 8042848400.

The previous prime is 20107121491. The next prime is 20107121519. The reversal of 20107121500 is 512170102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20106622 + ... + 20107621.

It is an arithmetic number, because the mean of its divisors is an integer number (1829748102).

Almost surely, 2^20107121500 is an apocalyptic number.

20107121500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20107121500 is an abundant number, since it is smaller than the sum of its proper divisors (23806832948).

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

20107121500 is a wasteful number, since it uses less digits than its factorization.

20107121500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40214262 (or 40214250 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 19.

Adding to 20107121500 its reverse (512170102), we get a palindrome (20619291602).

The spelling of 20107121500 in words is "twenty billion, one hundred seven million, one hundred twenty-one thousand, five hundred".