20634285 has 32 divisors (see below), whose sum is σ = 39720960. Its totient is φ = 8935488.

The previous prime is 20634259. The next prime is 20634293. The reversal of 20634285 is 58243602.

It is not a de Polignac number, because 20634285 - 2⁶ = 20634221 is a prime.

It is a super-2 number, since 2×20634285² = 851547434922450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3177 + ... + 7166.

It is an arithmetic number, because the mean of its divisors is an integer number (1241280).

Almost surely, 2^20634285 is an apocalyptic number.

It is an amenable number.

20634285 is a deficient number, since it is larger than the sum of its proper divisors (19086675).

20634285 is a wasteful number, since it uses less digits than its factorization.

20634285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10377.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 20634285 is about 4542.4976609790. The cubic root of 20634285 is about 274.2814741175.

Adding to 20634285 its reverse (58243602), we get a palindrome (78877887).

The spelling of 20634285 in words is "twenty million, six hundred thirty-four thousand, two hundred eighty-five".