20468649 has 16 divisors (see below), whose sum is σ = 28474880. Its totient is φ = 13063680.

The previous prime is 20468627. The next prime is 20468671. The reversal of 20468649 is 94686402.

It is an interprime number because it is at equal distance from previous prime (20468627) and next prime (20468671).

It is not a de Polignac number, because 20468649 - 2⁷ = 20468521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20468449) 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, 7887 + ... + 10155.

It is an arithmetic number, because the mean of its divisors is an integer number (1779680).

Almost surely, 2^20468649 is an apocalyptic number.

It is an amenable number.

20468649 is a deficient number, since it is larger than the sum of its proper divisors (8006231).

20468649 is a wasteful number, since it uses less digits than its factorization.

20468649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 20468649 is about 4524.2291056046. The cubic root of 20468649 is about 273.5455954161.

The spelling of 20468649 in words is "twenty million, four hundred sixty-eight thousand, six hundred forty-nine".