20631516 has 12 divisors (see below), whose sum is σ = 48140232. Its totient is φ = 6877168.

The previous prime is 20631509. The next prime is 20631547. The reversal of 20631516 is 61513602.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 859635 + ... + 859658.

It is an arithmetic number, because the mean of its divisors is an integer number (4011686).

Almost surely, 2^20631516 is an apocalyptic number.

It is an amenable number.

20631516 is an abundant number, since it is smaller than the sum of its proper divisors (27508716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20631516 is a wasteful number, since it uses less digits than its factorization.

20631516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719300 (or 1719298 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20631516 is about 4542.1928624839. The cubic root of 20631516 is about 274.2692045804.

The spelling of 20631516 in words is "twenty million, six hundred thirty-one thousand, five hundred sixteen".