20401328 has 20 divisors (see below), whose sum is σ = 40177488. Its totient is φ = 10032960.

The previous prime is 20401321. The next prime is 20401333. The reversal of 20401328 is 82310402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9476 + ... + 11427.

Almost surely, 2^20401328 is an apocalyptic number.

It is an amenable number.

20401328 is a deficient number, since it is larger than the sum of its proper divisors (19776160).

20401328 is a wasteful number, since it uses less digits than its factorization.

20401328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20972 (or 20966 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20401328 is about 4516.7829259330. The cubic root of 20401328 is about 273.2453705981.

The spelling of 20401328 in words is "twenty million, four hundred one thousand, three hundred twenty-eight".