20729448 has 48 divisors (see below), whose sum is σ = 56609280. Its totient is φ = 6852384.

The previous prime is 20729419. The next prime is 20729479. The reversal of 20729448 is 84492702.

20729448 is a `hidden beast` number, since 207 + 2 + 9 + 448 = 666.

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 11 ways as a sum of consecutive naturals, for example, 8011 + ... + 10277.

It is an arithmetic number, because the mean of its divisors is an integer number (1179360).

Almost surely, 2^20729448 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 20729448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28304640).

20729448 is an abundant number, since it is smaller than the sum of its proper divisors (35879832).

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

20729448 is a wasteful number, since it uses less digits than its factorization.

20729448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406 (or 2399 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20729448 is about 4552.9603556368. The cubic root of 20729448 is about 274.7024793324.

The spelling of 20729448 in words is "twenty million, seven hundred twenty-nine thousand, four hundred forty-eight".