20545631 has 8 divisors (see below), whose sum is σ = 21924720. Its totient is φ = 19196352.

The previous prime is 20545607. The next prime is 20545663. The reversal of 20545631 is 13654502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20545631 is a prime.

It is a super-2 number, since 2×20545631² = 844245906376322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20545631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6020 + ... + 8793.

It is an arithmetic number, because the mean of its divisors is an integer number (2740590).

Almost surely, 2^20545631 is an apocalyptic number.

20545631 is a deficient number, since it is larger than the sum of its proper divisors (1379089).

20545631 is a wasteful number, since it uses less digits than its factorization.

20545631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14905.

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

The square root of 20545631 is about 4532.7288690148. The cubic root of 20545631 is about 273.8880987640. Note that the first 3 decimals are identical.

The spelling of 20545631 in words is "twenty million, five hundred forty-five thousand, six hundred thirty-one".