20400460 has 12 divisors (see below), whose sum is σ = 42841008. Its totient is φ = 8160176.

The previous prime is 20400439. The next prime is 20400463. The reversal of 20400460 is 6400402.

It is not an unprimeable number, because it can be changed into a prime (20400463) 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, 509992 + ... + 510031.

It is an arithmetic number, because the mean of its divisors is an integer number (3570084).

Almost surely, 2^20400460 is an apocalyptic number.

20400460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400460 is an abundant number, since it is smaller than the sum of its proper divisors (22440548).

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

20400460 is a wasteful number, since it uses less digits than its factorization.

20400460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020032 (or 1020030 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20400460 is about 4516.6868388233. The cubic root of 20400460 is about 273.2414953545.

Adding to 20400460 its reverse (6400402), we get a palindrome (26800862).

The spelling of 20400460 in words is "twenty million, four hundred thousand, four hundred sixty".