20646002405 has 16 divisors (see below), whose sum is σ = 29079776640. Its totient is φ = 13774629312.

The previous prime is 20646002401. The next prime is 20646002431. The reversal of 20646002405 is 50420064602.

It is a cyclic number.

It is not a de Polignac number, because 20646002405 - 2² = 20646002401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646002401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7970135 + ... + 7972724.

It is an arithmetic number, because the mean of its divisors is an integer number (1817486040).

Almost surely, 2^20646002405 is an apocalyptic number.

It is an amenable number.

20646002405 is a deficient number, since it is larger than the sum of its proper divisors (8433774235).

20646002405 is a wasteful number, since it uses less digits than its factorization.

20646002405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15942908.

The product of its (nonzero) digits is 11520, while the sum is 29.

The spelling of 20646002405 in words is "twenty billion, six hundred forty-six million, two thousand, four hundred five".