20621199 has 8 divisors (see below), whose sum is σ = 27613872. Its totient is φ = 13688000.

The previous prime is 20621191. The next prime is 20621239. The reversal of 20621199 is 99112602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20621199 - 2³ = 20621191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20621191) 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, 14052 + ... + 15449.

It is an arithmetic number, because the mean of its divisors is an integer number (3451734).

Almost surely, 2^20621199 is an apocalyptic number.

20621199 is a deficient number, since it is larger than the sum of its proper divisors (6992673).

20621199 is a wasteful number, since it uses less digits than its factorization.

20621199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29737.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 20621199 is about 4541.0570355370. The cubic root of 20621199 is about 274.2234799202.

The spelling of 20621199 in words is "twenty million, six hundred twenty-one thousand, one hundred ninety-nine".