20273664 has 80 divisors (see below), whose sum is σ = 55094688. Its totient is φ = 6623232.

The previous prime is 20273651. The next prime is 20273681. The reversal of 20273664 is 46637202.

It is a super-2 number, since 2×20273664² = 822042903969792, which contains 22 as substring.

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, 102814 + ... + 103010.

Almost surely, 2^20273664 is an apocalyptic number.

20273664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20273664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27547344).

20273664 is an abundant number, since it is smaller than the sum of its proper divisors (34821024).

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

20273664 is an equidigital number, since it uses as much as digits as its factorization.

20273664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 20273664 is about 4502.6285656270. The cubic root of 20273664 is about 272.6742212770.

The spelling of 20273664 in words is "twenty million, two hundred seventy-three thousand, six hundred sixty-four".