20471995 has 16 divisors (see below), whose sum is σ = 26150688. Its totient is φ = 15331840.

The previous prime is 20471977. The next prime is 20472007. The reversal of 20471995 is 59917402.

It is not a de Polignac number, because 20471995 - 2⁵ = 20471963 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18765 + ... + 19825.

It is an arithmetic number, because the mean of its divisors is an integer number (1634418).

Almost surely, 2^20471995 is an apocalyptic number.

20471995 is a deficient number, since it is larger than the sum of its proper divisors (5678693).

20471995 is a wasteful number, since it uses less digits than its factorization.

20471995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 20471995 is about 4524.5988772487. The cubic root of 20471995 is about 273.5605000587.

The spelling of 20471995 in words is "twenty million, four hundred seventy-one thousand, nine hundred ninety-five".