20660477 has 4 divisors (see below), whose sum is σ = 21326976. Its totient is φ = 19993980.

The previous prime is 20660473. The next prime is 20660483. The reversal of 20660477 is 77406602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20660477 - 2² = 20660473 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333203 + ... + 333264.

It is an arithmetic number, because the mean of its divisors is an integer number (5331744).

Almost surely, 2^20660477 is an apocalyptic number.

It is an amenable number.

20660477 is a deficient number, since it is larger than the sum of its proper divisors (666499).

20660477 is an equidigital number, since it uses as much as digits as its factorization.

20660477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666498.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 20660477 is about 4545.3797421118. The cubic root of 20660477 is about 274.3974775372.

The spelling of 20660477 in words is "twenty million, six hundred sixty thousand, four hundred seventy-seven".