20600400 has 60 divisors (see below), whose sum is σ = 65993792. Its totient is φ = 5493120.

The previous prime is 20600383. The next prime is 20600407. The reversal of 20600400 is 400602.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20600407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7384 + ... + 9783.

Almost surely, 2^20600400 is an apocalyptic number.

20600400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20600400 is an abundant number, since it is smaller than the sum of its proper divisors (45393392).

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

20600400 is a wasteful number, since it uses less digits than its factorization.

20600400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17188 (or 17177 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20600400 is about 4538.7663522151. The cubic root of 20600400 is about 274.1312529387.

The spelling of 20600400 in words is "twenty million, six hundred thousand, four hundred".