20948715405 has 48 divisors (see below), whose sum is σ = 36635848704. Its totient is φ = 11072920320.

The previous prime is 20948715391. The next prime is 20948715419. The reversal of 20948715405 is 50451784902.

20948715405 is a `hidden beast` number, since 20 + 9 + 4 + 87 + 1 + 540 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (20948715391) and next prime (20948715419).

It is not a de Polignac number, because 20948715405 - 2⁸ = 20948715149 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9182865 + ... + 9185145.

It is an arithmetic number, because the mean of its divisors is an integer number (763246848).

Almost surely, 2^20948715405 is an apocalyptic number.

It is an amenable number.

20948715405 is a deficient number, since it is larger than the sum of its proper divisors (15687133299).

20948715405 is a wasteful number, since it uses less digits than its factorization.

20948715405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4026 (or 4023 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 20948715405 in words is "twenty billion, nine hundred forty-eight million, seven hundred fifteen thousand, four hundred five".