20511612632505 has 32 divisors (see below), whose sum is σ = 33208885444608. Its totient is φ = 10810183608000.

The previous prime is 20511612632479. The next prime is 20511612632521. The reversal of 20511612632505 is 50523621611502.

It is not a de Polignac number, because 20511612632505 - 2¹⁶ = 20511612566969 is a prime.

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, 23273929 + ... + 24139158.

It is an arithmetic number, because the mean of its divisors is an integer number (1037777670144).

Almost surely, 2^{20511612632505} is an apocalyptic number.

It is an amenable number.

20511612632505 is a deficient number, since it is larger than the sum of its proper divisors (12697272812103).

20511612632505 is a wasteful number, since it uses less digits than its factorization.

20511612632505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47413437.

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 20511612632505 in words is "twenty trillion, five hundred eleven billion, six hundred twelve million, six hundred thirty-two thousand, five hundred five".