20621234 has 8 divisors (see below), whose sum is σ = 31168368. Its totient is φ = 10231780.

The previous prime is 20621191. The next prime is 20621239. The reversal of 20621234 is 43212602.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20621239) 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, 39092 + ... + 39615.

It is an arithmetic number, because the mean of its divisors is an integer number (3896046).

Almost surely, 2^20621234 is an apocalyptic number.

20621234 is a deficient number, since it is larger than the sum of its proper divisors (10547134).

20621234 is a wasteful number, since it uses less digits than its factorization.

20621234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78840.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20621234 is about 4541.0608892637. The cubic root of 20621234 is about 274.2236350650.

Adding to 20621234 its reverse (43212602), we get a palindrome (63833836).

The spelling of 20621234 in words is "twenty million, six hundred twenty-one thousand, two hundred thirty-four".