20813626745 has 8 divisors (see below), whose sum is σ = 26445549384. Its totient is φ = 15671436544.

The previous prime is 20813626709. The next prime is 20813626777. The reversal of 20813626745 is 54762631802.

It can be written as a sum of positive squares in 4 ways, for example, as 2137397824 + 18676228921 = 46232^2 + 136661^2 .

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 20813626745 - 2⁶ = 20813626681 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20813626696 and 20813626705.

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, 122433014 + ... + 122433183.

It is an arithmetic number, because the mean of its divisors is an integer number (3305693673).

Almost surely, 2^20813626745 is an apocalyptic number.

It is an amenable number.

20813626745 is a deficient number, since it is larger than the sum of its proper divisors (5631922639).

20813626745 is a wasteful number, since it uses less digits than its factorization.

20813626745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244866219.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 20813626745 in words is "twenty billion, eight hundred thirteen million, six hundred twenty-six thousand, seven hundred forty-five".