20621274 has 16 divisors (see below), whose sum is σ = 41622240. Its totient is φ = 6810480.

The previous prime is 20621273. The next prime is 20621281. The reversal of 20621274 is 47212602.

It is not an unprimeable number, because it can be changed into a prime (20621273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15112 + ... + 16419.

It is an arithmetic number, because the mean of its divisors is an integer number (2601390).

Almost surely, 2^20621274 is an apocalyptic number.

20621274 is an abundant number, since it is smaller than the sum of its proper divisors (21000966).

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

20621274 is a wasteful number, since it uses less digits than its factorization.

20621274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31645.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20621274 is about 4541.0652935187. The cubic root of 20621274 is about 274.2238123732.

Adding to 20621274 its reverse (47212602), we get a palindrome (67833876).

The spelling of 20621274 in words is "twenty million, six hundred twenty-one thousand, two hundred seventy-four".