20421096 has 16 divisors (see below), whose sum is σ = 51052800. Its totient is φ = 6807024.

The previous prime is 20421073. The next prime is 20421103. The reversal of 20421096 is 69012402.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 850879 = 20421096 / (2 + 0 + 4 + 2 + 1 + 0 + 9 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425416 + ... + 425463.

It is an arithmetic number, because the mean of its divisors is an integer number (3190800).

Almost surely, 2^20421096 is an apocalyptic number.

It is an amenable number.

20421096 is an abundant number, since it is smaller than the sum of its proper divisors (30631704).

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

20421096 is a wasteful number, since it uses less digits than its factorization.

20421096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850888 (or 850884 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20421096 is about 4518.9706792587. The cubic root of 20421096 is about 273.3335964040. Note that the first 3 decimals are identical.

Adding to 20421096 its reverse (69012402), we get a palindrome (89433498).

The spelling of 20421096 in words is "twenty million, four hundred twenty-one thousand, ninety-six".