20315111421620 has 12 divisors (see below), whose sum is σ = 42661733985444. Its totient is φ = 8126044568640.

The previous prime is 20315111421607. The next prime is 20315111421643. The reversal of 20315111421620 is 2612411151302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8665463888656 + 11649647532964 = 2943716^2 + 3413158^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507877785521 + ... + 507877785560.

It is an arithmetic number, because the mean of its divisors is an integer number (3555144498787).

Almost surely, 2^{20315111421620} is an apocalyptic number.

20315111421620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20315111421620 is an abundant number, since it is smaller than the sum of its proper divisors (22346622563824).

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

20315111421620 is a wasteful number, since it uses less digits than its factorization.

20315111421620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015755571090 (or 1015755571088 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 20315111421620 its reverse (2612411151302), we get a palindrome (22927522572922).

The spelling of 20315111421620 in words is "twenty trillion, three hundred fifteen billion, one hundred eleven million, four hundred twenty-one thousand, six hundred twenty".