20405632415 has 16 divisors (see below), whose sum is σ = 28246413312. Its totient is φ = 13861660704.

The previous prime is 20405632381. The next prime is 20405632439. The reversal of 20405632415 is 51423650402.

It is a cyclic number.

It is not a de Polignac number, because 20405632415 - 2¹⁰ = 20405631391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2720639 + ... + 2728128.

It is an arithmetic number, because the mean of its divisors is an integer number (1765400832).

Almost surely, 2^20405632415 is an apocalyptic number.

20405632415 is a deficient number, since it is larger than the sum of its proper divisors (7840780897).

20405632415 is a wasteful number, since it uses less digits than its factorization.

20405632415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5448886.

The product of its (nonzero) digits is 28800, while the sum is 32.

The spelling of 20405632415 in words is "twenty billion, four hundred five million, six hundred thirty-two thousand, four hundred fifteen".