20723408 has 40 divisors (see below), whose sum is σ = 43245000. Its totient is φ = 9584640.

The previous prime is 20723401. The next prime is 20723411. The reversal of 20723408 is 80432702.

It can be written as a sum of positive squares in 4 ways, for example, as 760384 + 19963024 = 872^2 + 4468^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20723401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15968 + ... + 17216.

It is an arithmetic number, because the mean of its divisors is an integer number (1081125).

Almost surely, 2^20723408 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 20723408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21622500).

20723408 is an abundant number, since it is smaller than the sum of its proper divisors (22521592).

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

20723408 is a wasteful number, since it uses less digits than its factorization.

20723408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20723408 is about 4552.2970026131. The cubic root of 20723408 is about 274.6757964519.

The spelling of 20723408 in words is "twenty million, seven hundred twenty-three thousand, four hundred eight".