20315121090 has 64 divisors (see below), whose sum is σ = 53917356672. Its totient is φ = 4857408000.

The previous prime is 20315121077. The next prime is 20315121107. The reversal of 20315121090 is 9012151302.

It is a self number, because there is not a number n which added to its sum of digits gives 20315121090.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 397561 + ... + 445740.

It is an arithmetic number, because the mean of its divisors is an integer number (842458698).

Almost surely, 2^20315121090 is an apocalyptic number.

20315121090 is an abundant number, since it is smaller than the sum of its proper divisors (33602235582).

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

20315121090 is a wasteful number, since it uses less digits than its factorization.

20315121090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843395.

The product of its (nonzero) digits is 540, while the sum is 24.

Adding to 20315121090 its reverse (9012151302), we get a palindrome (29327272392).

The spelling of 20315121090 in words is "twenty billion, three hundred fifteen million, one hundred twenty-one thousand, ninety".