20912963953 has 4 divisors (see below), whose sum is σ = 23900530240. Its totient is φ = 17925397668.

The previous prime is 20912963891. The next prime is 20912963983. The reversal of 20912963953 is 35936921902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20912963953 - 2¹⁷ = 20912832881 is a prime.

It is a super-2 number, since 2×20912963953² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20912963897 and 20912963906.

It is not an unprimeable number, because it can be changed into a prime (20912963983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1493783133 + ... + 1493783146.

It is an arithmetic number, because the mean of its divisors is an integer number (5975132560).

Almost surely, 2^20912963953 is an apocalyptic number.

It is an amenable number.

20912963953 is a deficient number, since it is larger than the sum of its proper divisors (2987566287).

20912963953 is an equidigital number, since it uses as much as digits as its factorization.

20912963953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2987566286.

The product of its (nonzero) digits is 787320, while the sum is 49.

The spelling of 20912963953 in words is "twenty billion, nine hundred twelve million, nine hundred sixty-three thousand, nine hundred fifty-three".