20631545 has 8 divisors (see below), whose sum is σ = 27008640. Its totient is φ = 15004720.

The previous prime is 20631509. The next prime is 20631547. The reversal of 20631545 is 54513602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20631545 - 2¹² = 20627449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20631547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187505 + ... + 187614.

It is an arithmetic number, because the mean of its divisors is an integer number (3376080).

Almost surely, 2^20631545 is an apocalyptic number.

It is an amenable number.

20631545 is a deficient number, since it is larger than the sum of its proper divisors (6377095).

20631545 is a wasteful number, since it uses less digits than its factorization.

20631545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375135.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20631545 is about 4542.1960547735. The cubic root of 20631545 is about 274.2693330861.

The spelling of 20631545 in words is "twenty million, six hundred thirty-one thousand, five hundred forty-five".