20653768 has 8 divisors (see below), whose sum is σ = 38725830. Its totient is φ = 10326880.

The previous prime is 20653673. The next prime is 20653769. The reversal of 20653768 is 86735602.

It can be written as a sum of positive squares in only one way, i.e., 14884164 + 5769604 = 3858^2 + 2402^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20653769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290853 + ... + 1290868.

Almost surely, 2^20653768 is an apocalyptic number.

It is an amenable number.

20653768 is a deficient number, since it is larger than the sum of its proper divisors (18072062).

20653768 is a wasteful number, since it uses less digits than its factorization.

20653768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581727 (or 2581723 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 20653768 is about 4544.6416800448. The cubic root of 20653768 is about 274.3677729636.

The spelling of 20653768 in words is "twenty million, six hundred fifty-three thousand, seven hundred sixty-eight".