20421034 has 8 divisors (see below), whose sum is σ = 31378788. Its totient is φ = 9961440.

The previous prime is 20421013. The next prime is 20421043. The reversal of 20421034 is 43012402.

It can be written as a sum of positive squares in 2 ways, for example, as 20223009 + 198025 = 4497^2 + 445^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20420999 and 20421017.

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, 124437 + ... + 124600.

Almost surely, 2^20421034 is an apocalyptic number.

20421034 is a deficient number, since it is larger than the sum of its proper divisors (10957754).

20421034 is a wasteful number, since it uses less digits than its factorization.

20421034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249080.

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

The square root of 20421034 is about 4518.9638192842. The cubic root of 20421034 is about 273.3333197832. Note that the first 4 decimals are identical.

Adding to 20421034 its reverse (43012402), we get a palindrome (63433436).

The spelling of 20421034 in words is "twenty million, four hundred twenty-one thousand, thirty-four".