20869164 has 60 divisors (see below), whose sum is σ = 55922328. Its totient is φ = 6782400.

The previous prime is 20869159. The next prime is 20869181. The reversal of 20869164 is 46196802.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12499 + ... + 14069.

Almost surely, 2^20869164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20869164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27961164).

20869164 is an abundant number, since it is smaller than the sum of its proper divisors (35053164).

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

20869164 is a wasteful number, since it uses less digits than its factorization.

20869164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628 (or 1617 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20869164 is about 4568.2780125557. The cubic root of 20869164 is about 275.3182607321.

The spelling of 20869164 in words is "twenty million, eight hundred sixty-nine thousand, one hundred sixty-four".