20470261 has 24 divisors (see below), whose sum is σ = 25738560. Its totient is φ = 15891840.

The previous prime is 20470249. The next prime is 20470291. The reversal of 20470261 is 16207402.

It is not a de Polignac number, because 20470261 - 2⁷ = 20470133 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 (20470291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114270 + ... + 114448.

It is an arithmetic number, because the mean of its divisors is an integer number (1072440).

Almost surely, 2^20470261 is an apocalyptic number.

It is an amenable number.

20470261 is a deficient number, since it is larger than the sum of its proper divisors (5268299).

20470261 is a wasteful number, since it uses less digits than its factorization.

20470261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20470261 is about 4524.4072539947. The cubic root of 20470261 is about 273.5527762177.

Adding to 20470261 its reverse (16207402), we get a palindrome (36677663).

The spelling of 20470261 in words is "twenty million, four hundred seventy thousand, two hundred sixty-one".