20215115612 has 12 divisors (see below), whose sum is σ = 36332572920. Its totient is φ = 9834380496.

The previous prime is 20215115563. The next prime is 20215115623. The reversal of 20215115612 is 21651151202.

It is a super-2 number, since 2×20215115612² (a number of 21 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 68294162 + ... + 68294457.

It is an arithmetic number, because the mean of its divisors is an integer number (3027714410).

Almost surely, 2^20215115612 is an apocalyptic number.

It is an amenable number.

20215115612 is a deficient number, since it is larger than the sum of its proper divisors (16117457308).

20215115612 is a wasteful number, since it uses less digits than its factorization.

20215115612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136588660 (or 136588658 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 20215115612 its reverse (21651151202), we get a palindrome (41866266814).

The spelling of 20215115612 in words is "twenty billion, two hundred fifteen million, one hundred fifteen thousand, six hundred twelve".