20908252905 has 32 divisors (see below), whose sum is σ = 34011532800. Its totient is φ = 10966444800.

The previous prime is 20908252847. The next prime is 20908252909. The reversal of 20908252905 is 50925280902.

It is not a de Polignac number, because 20908252905 - 2¹³ = 20908244713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20908252909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179424 + ... + 272046.

It is an arithmetic number, because the mean of its divisors is an integer number (1062860400).

Almost surely, 2^20908252905 is an apocalyptic number.

It is an amenable number.

20908252905 is a deficient number, since it is larger than the sum of its proper divisors (13103279895).

20908252905 is a wasteful number, since it uses less digits than its factorization.

20908252905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92881.

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 20908252905 in words is "twenty billion, nine hundred eight million, two hundred fifty-two thousand, nine hundred five".