20649895 has 8 divisors (see below), whose sum is σ = 28319904. Its totient is φ = 14159904.

The previous prime is 20649887. The next prime is 20649901. The reversal of 20649895 is 59894602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20649895 - 2³ = 20649887 is a prime.

It is a super-2 number, since 2×20649895² = 852836327022050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294964 + ... + 295033.

It is an arithmetic number, because the mean of its divisors is an integer number (3539988).

Almost surely, 2^20649895 is an apocalyptic number.

20649895 is a deficient number, since it is larger than the sum of its proper divisors (7670009).

20649895 is an equidigital number, since it uses as much as digits as its factorization.

20649895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590009.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 20649895 is about 4544.2155538663. The cubic root of 20649895 is about 274.3506220525.

The spelling of 20649895 in words is "twenty million, six hundred forty-nine thousand, eight hundred ninety-five".