20958652405 has 8 divisors (see below), whose sum is σ = 25830123192. Its totient is φ = 16313761728.

The previous prime is 20958652399. The next prime is 20958652417. The reversal of 20958652405 is 50425685902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1178480241 + 19780172164 = 34329^2 + 140642^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20958652405 - 2⁷ = 20958652277 is a prime.

It is a super-2 number, since 2×20958652405² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56644822 + ... + 56645191.

It is an arithmetic number, because the mean of its divisors is an integer number (3228765399).

Almost surely, 2^20958652405 is an apocalyptic number.

It is an amenable number.

20958652405 is a deficient number, since it is larger than the sum of its proper divisors (4871470787).

20958652405 is a wasteful number, since it uses less digits than its factorization.

20958652405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113290055.

The product of its (nonzero) digits is 864000, while the sum is 46.

The spelling of 20958652405 in words is "twenty billion, nine hundred fifty-eight million, six hundred fifty-two thousand, four hundred five".