20400672 has 24 divisors (see below), whose sum is σ = 53552016. Its totient is φ = 6800192.

The previous prime is 20400671. The next prime is 20400673. The reversal of 20400672 is 27600402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20400671) and next prime (20400673).

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (20400671) 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, 106158 + ... + 106349.

It is an arithmetic number, because the mean of its divisors is an integer number (2231334).

Almost surely, 2^20400672 is an apocalyptic number.

It is an amenable number.

20400672 is an abundant number, since it is smaller than the sum of its proper divisors (33151344).

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

20400672 is a wasteful number, since it uses less digits than its factorization.

20400672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212520 (or 212512 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20400672 is about 4516.7103072922. The cubic root of 20400672 is about 273.2424418527.

The spelling of 20400672 in words is "twenty million, four hundred thousand, six hundred seventy-two".