20651049 has 12 divisors (see below), whose sum is σ = 29956212. Its totient is φ = 13708800.

The previous prime is 20651047. The next prime is 20651063. The reversal of 20651049 is 94015602.

20651049 is a `hidden beast` number, since 2 + 0 + 651 + 0 + 4 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12425625 + 8225424 = 3525^2 + 2868^2 .

It is not a de Polignac number, because 20651049 - 2¹ = 20651047 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2592 + ... + 6929.

It is an arithmetic number, because the mean of its divisors is an integer number (2496351).

Almost surely, 2^20651049 is an apocalyptic number.

It is an amenable number.

20651049 is a deficient number, since it is larger than the sum of its proper divisors (9305163).

20651049 is a wasteful number, since it uses less digits than its factorization.

20651049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9768 (or 9765 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20651049 is about 4544.3425267028. The cubic root of 20651049 is about 274.3557325663.

The spelling of 20651049 in words is "twenty million, six hundred fifty-one thousand, forty-nine".