20621194 has 16 divisors (see below), whose sum is σ = 35520480. Its totient is φ = 8879760.

The previous prime is 20621191. The next prime is 20621239. The reversal of 20621194 is 49112602.

It is not an unprimeable number, because it can be changed into a prime (20621191) 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, 24249 + ... + 25084.

It is an arithmetic number, because the mean of its divisors is an integer number (2220030).

Almost surely, 2^20621194 is an apocalyptic number.

20621194 is a deficient number, since it is larger than the sum of its proper divisors (14899286).

20621194 is a wasteful number, since it uses less digits than its factorization.

20621194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49365.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20621194 is about 4541.0564850043. The cubic root of 20621194 is about 274.2234577566.

Adding to 20621194 its reverse (49112602), we get a palindrome (69733796).

The spelling of 20621194 in words is "twenty million, six hundred twenty-one thousand, one hundred ninety-four".