20461895 has 4 divisors (see below), whose sum is σ = 24554280. Its totient is φ = 16369512.

The previous prime is 20461853. The next prime is 20461913. The reversal of 20461895 is 59816402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59816402 = 2 ⋅29908201.

It is a cyclic number.

It is not a de Polignac number, because 20461895 - 2¹⁰ = 20460871 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2046185 + ... + 2046194.

It is an arithmetic number, because the mean of its divisors is an integer number (6138570).

Almost surely, 2^20461895 is an apocalyptic number.

20461895 is a deficient number, since it is larger than the sum of its proper divisors (4092385).

20461895 is an equidigital number, since it uses as much as digits as its factorization.

20461895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092384.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20461895 is about 4523.4826185142. The cubic root of 20461895 is about 273.5155050048.

The spelling of 20461895 in words is "twenty million, four hundred sixty-one thousand, eight hundred ninety-five".