20944724285 has 8 divisors (see below), whose sum is σ = 26612120376. Its totient is φ = 15770145280.

The previous prime is 20944724279. The next prime is 20944724287. The reversal of 20944724285 is 58242744902.

It can be written as a sum of positive squares in 4 ways, for example, as 11093566276 + 9851158009 = 105326^2 + 99253^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-20944724285 is a prime.

It is a super-2 number, since 2×20944724285² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20944724287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123204176 + ... + 123204345.

It is an arithmetic number, because the mean of its divisors is an integer number (3326515047).

Almost surely, 2^20944724285 is an apocalyptic number.

It is an amenable number.

20944724285 is a deficient number, since it is larger than the sum of its proper divisors (5667396091).

20944724285 is a wasteful number, since it uses less digits than its factorization.

20944724285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246408543.

The product of its (nonzero) digits is 1290240, while the sum is 47.

The spelling of 20944724285 in words is "twenty billion, nine hundred forty-four million, seven hundred twenty-four thousand, two hundred eighty-five".