20969916 has 24 divisors (see below), whose sum is σ = 53378304. Its totient is φ = 6354480.

The previous prime is 20969903. The next prime is 20969953. The reversal of 20969916 is 61996902.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79300 + ... + 79563.

It is an arithmetic number, because the mean of its divisors is an integer number (2224096).

Almost surely, 2^20969916 is an apocalyptic number.

It is an amenable number.

20969916 is an abundant number, since it is smaller than the sum of its proper divisors (32408388).

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

20969916 is a wasteful number, since it uses less digits than its factorization.

20969916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158881 (or 158879 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 20969916 is about 4579.2920850280. The cubic root of 20969916 is about 275.7606094782.

It can be divided in two parts, 209 and 69916, that added together give a triangular number (70125 = T₃₇₄).

The spelling of 20969916 in words is "twenty million, nine hundred sixty-nine thousand, nine hundred sixteen".