20629815845 has 8 divisors (see below), whose sum is σ = 25832117376. Its totient is φ = 15786293776.

The previous prime is 20629815749. The next prime is 20629815851. The reversal of 20629815845 is 54851892602.

It is a happy number.

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 20629815845 - 2⁸ = 20629815589 is a prime.

It is a super-2 number, since 2×20629815845² (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 = 20629815793 and 20629815802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89694737 + ... + 89694966.

It is an arithmetic number, because the mean of its divisors is an integer number (3229014672).

Almost surely, 2^20629815845 is an apocalyptic number.

It is an amenable number.

20629815845 is a deficient number, since it is larger than the sum of its proper divisors (5202301531).

20629815845 is a wasteful number, since it uses less digits than its factorization.

20629815845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179389731.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 20629815845 in words is "twenty billion, six hundred twenty-nine million, eight hundred fifteen thousand, eight hundred forty-five".