20511053644 has 12 divisors (see below), whose sum is σ = 35919057664. Its totient is φ = 10248465744.

The previous prime is 20511053599. The next prime is 20511053657. The reversal of 20511053644 is 44635011502.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1758732 + ... + 1770355.

Almost surely, 2^20511053644 is an apocalyptic number.

It is an amenable number.

20511053644 is a deficient number, since it is larger than the sum of its proper divisors (15408004020).

20511053644 is a wasteful number, since it uses less digits than its factorization.

20511053644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3530544 (or 3530542 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 20511053644 in words is "twenty billion, five hundred eleven million, fifty-three thousand, six hundred forty-four".