20415895 has 16 divisors (see below), whose sum is σ = 26103168. Its totient is φ = 15275520.

The previous prime is 20415869. The next prime is 20415911. The reversal of 20415895 is 59851402.

It is not a de Polignac number, because 20415895 - 2⁷ = 20415767 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 20415895.

It is a congruent 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, 14722 + ... + 16048.

It is an arithmetic number, because the mean of its divisors is an integer number (1631448).

Almost surely, 2^20415895 is an apocalyptic number.

20415895 is a deficient number, since it is larger than the sum of its proper divisors (5687273).

20415895 is a wasteful number, since it uses less digits than its factorization.

20415895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 20415895 is about 4518.3951797071. The cubic root of 20415895 is about 273.3103895409.

The spelling of 20415895 in words is "twenty million, four hundred fifteen thousand, eight hundred ninety-five".