20472681 has 16 divisors (see below), whose sum is σ = 27967680. Its totient is φ = 13316160.

The previous prime is 20472659. The next prime is 20472703. The reversal of 20472681 is 18627402.

It is an interprime number because it is at equal distance from previous prime (20472659) and next prime (20472703).

It is not a de Polignac number, because 20472681 - 2⁹ = 20472169 is a prime.

It is a super-2 number, since 2×20472681² = 838261334655522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20472611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52435 + ... + 52823.

It is an arithmetic number, because the mean of its divisors is an integer number (1747980).

Almost surely, 2^20472681 is an apocalyptic number.

It is an amenable number.

20472681 is a deficient number, since it is larger than the sum of its proper divisors (7494999).

20472681 is a wasteful number, since it uses less digits than its factorization.

20472681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20472681 is about 4524.6746844387. The cubic root of 20472681 is about 273.5635556216.

The spelling of 20472681 in words is "twenty million, four hundred seventy-two thousand, six hundred eighty-one".