20660470291 has 8 divisors (see below), whose sum is σ = 21756540960. Its totient is φ = 19580882112.

The previous prime is 20660470253. The next prime is 20660470309. The reversal of 20660470291 is 19207406602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20660470291 - 2¹³ = 20660462099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20660470291.

It is not an unprimeable number, because it can be changed into a prime (20660470241) 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, 4118050 + ... + 4123063.

It is an arithmetic number, because the mean of its divisors is an integer number (2719567620).

Almost surely, 2^20660470291 is an apocalyptic number.

20660470291 is a deficient number, since it is larger than the sum of its proper divisors (1096070669).

20660470291 is a wasteful number, since it uses less digits than its factorization.

20660470291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8241245.

The product of its (nonzero) digits is 36288, while the sum is 37.

Adding to 20660470291 its reverse (19207406602), we get a palindrome (39867876893).

The spelling of 20660470291 in words is "twenty billion, six hundred sixty million, four hundred seventy thousand, two hundred ninety-one".