20649143746 has 16 divisors (see below), whose sum is σ = 38616580800. Its totient is φ = 8045120880.

The previous prime is 20649143743. The next prime is 20649143747. The reversal of 20649143746 is 64734194602.

It is a junction number, because it is equal to n+sod(n) for n = 20649143696 and 20649143705.

It is not an unprimeable number, because it can be changed into a prime (20649143743) 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, 67042521 + ... + 67042828.

It is an arithmetic number, because the mean of its divisors is an integer number (2413536300).

Almost surely, 2^20649143746 is an apocalyptic number.

20649143746 is a deficient number, since it is larger than the sum of its proper divisors (17967437054).

20649143746 is a wasteful number, since it uses less digits than its factorization.

20649143746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134085369.

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 20649143746 in words is "twenty billion, six hundred forty-nine million, one hundred forty-three thousand, seven hundred forty-six".