20631045 has 16 divisors (see below), whose sum is σ = 33633792. Its totient is φ = 10795200.

The previous prime is 20631043. The next prime is 20631097. The reversal of 20631045 is 54013602.

It is a happy number.

It is not a de Polignac number, because 20631045 - 2¹ = 20631043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20631043) 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, 12181 + ... + 13770.

It is an arithmetic number, because the mean of its divisors is an integer number (2102112).

Almost surely, 2^20631045 is an apocalyptic number.

It is an amenable number.

20631045 is a deficient number, since it is larger than the sum of its proper divisors (13002747).

20631045 is a wasteful number, since it uses less digits than its factorization.

20631045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26012.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20631045 is about 4542.1410149840. The cubic root of 20631045 is about 274.2671174535.

Adding to 20631045 its reverse (54013602), we get a palindrome (74644647).

The spelling of 20631045 in words is "twenty million, six hundred thirty-one thousand, forty-five".