20550465 has 24 divisors (see below), whose sum is σ = 38361960. Its totient is φ = 10116864.

The previous prime is 20550463. The next prime is 20550469. The reversal of 20550465 is 56405502.

It can be written as a sum of positive squares in 4 ways, for example, as 408321 + 20142144 = 639^2 + 4488^2 .

It is not a de Polignac number, because 20550465 - 2¹ = 20550463 is a prime.

It is a super-2 number, since 2×20550465² = 844643223432450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16980 + ... + 18149.

It is an arithmetic number, because the mean of its divisors is an integer number (1598415).

Almost surely, 2^20550465 is an apocalyptic number.

It is an amenable number.

20550465 is a deficient number, since it is larger than the sum of its proper divisors (17811495).

20550465 is a wasteful number, since it uses less digits than its factorization.

20550465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35153 (or 35150 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 20550465 is about 4533.2620705183. The cubic root of 20550465 is about 273.9095773166.

Adding to 20550465 its reverse (56405502), we get a palindrome (76955967).

The spelling of 20550465 in words is "twenty million, five hundred fifty thousand, four hundred sixty-five".