20520350644 has 12 divisors (see below), whose sum is σ = 35914765600. Its totient is φ = 10258989048.

The previous prime is 20520350639. The next prime is 20520350647. The reversal of 20520350644 is 44605302502.

It is a super-2 number, since 2×20520350644² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520350647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257064 + ... + 327295.

Almost surely, 2^20520350644 is an apocalyptic number.

It is an amenable number.

20520350644 is a deficient number, since it is larger than the sum of its proper divisors (15394414956).

20520350644 is a wasteful number, since it uses less digits than its factorization.

20520350644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593142 (or 593140 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

The spelling of 20520350644 in words is "twenty billion, five hundred twenty million, three hundred fifty thousand, six hundred forty-four".