20969982 has 64 divisors (see below), whose sum is σ = 52081920. Its totient is φ = 6199200.

The previous prime is 20969953. The next prime is 20969989. The reversal of 20969982 is 28996902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20969989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25132 + ... + 25952.

It is an arithmetic number, because the mean of its divisors is an integer number (813780).

Almost surely, 2^20969982 is an apocalyptic number.

20969982 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20969982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26040960).

20969982 is an abundant number, since it is smaller than the sum of its proper divisors (31111938).

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

20969982 is a wasteful number, since it uses less digits than its factorization.

20969982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 20969982 is about 4579.2992913764. The cubic root of 20969982 is about 275.7608987845.

The spelling of 20969982 in words is "twenty million, nine hundred sixty-nine thousand, nine hundred eighty-two".