20421012 has 24 divisors (see below), whose sum is σ = 50452416. Its totient is φ = 6406528.

The previous prime is 20420999. The next prime is 20421013. The reversal of 20421012 is 21012402.

It is a super-2 number, since 2×20421012² = 834035462208288, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49848 + ... + 50255.

It is an arithmetic number, because the mean of its divisors is an integer number (2102184).

Almost surely, 2^20421012 is an apocalyptic number.

It is an amenable number.

20421012 is an abundant number, since it is smaller than the sum of its proper divisors (30031404).

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

20421012 is a wasteful number, since it uses less digits than its factorization.

20421012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100127 (or 100125 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 20421012 is about 4518.9613850972. The cubic root of 20421012 is about 273.3332216273. Note that the first 3 decimals are identical.

Adding to 20421012 its reverse (21012402), we get a palindrome (41433414).

The spelling of 20421012 in words is "twenty million, four hundred twenty-one thousand, twelve".