20661476 has 18 divisors (see below), whose sum is σ = 39744390. Its totient is φ = 9391360.

The previous prime is 20661463. The next prime is 20661523. The reversal of 20661476 is 67416602.

It can be written as a sum of positive squares in only one way, i.e., 16564900 + 4096576 = 4070^2 + 2024^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20861 + ... + 21828.

Almost surely, 2^20661476 is an apocalyptic number.

It is an amenable number.

20661476 is a deficient number, since it is larger than the sum of its proper divisors (19082914).

20661476 is a wasteful number, since it uses less digits than its factorization.

20661476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42715 (or 42702 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20661476 is about 4545.4896325919. The cubic root of 20661476 is about 274.4019001305.

The spelling of 20661476 in words is "twenty million, six hundred sixty-one thousand, four hundred seventy-six".