20662631 has 4 divisors (see below), whose sum is σ = 22541064. Its totient is φ = 18784200.

The previous prime is 20662619. The next prime is 20662637. The reversal of 20662631 is 13626602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20662631 is a prime.

It is a super-3 number, since 3×20662631³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 20662631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20662637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939200 + ... + 939221.

It is an arithmetic number, because the mean of its divisors is an integer number (5635266).

Almost surely, 2^20662631 is an apocalyptic number.

20662631 is a deficient number, since it is larger than the sum of its proper divisors (1878433).

20662631 is a wasteful number, since it uses less digits than its factorization.

20662631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878432.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20662631 is about 4545.6166798356. The cubic root of 20662631 is about 274.4070131613.

The spelling of 20662631 in words is "twenty million, six hundred sixty-two thousand, six hundred thirty-one".