20628019 has 8 divisors (see below), whose sum is σ = 21407760. Its totient is φ = 19852896.

The previous prime is 20628011. The next prime is 20628029. The reversal of 20628019 is 91082602.

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 20628019 - 2³ = 20628011 is a prime.

It is a super-2 number, since 2×20628019² = 851030335728722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20628011) 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, 9864 + ... + 11770.

It is an arithmetic number, because the mean of its divisors is an integer number (2675970).

Almost surely, 2^20628019 is an apocalyptic number.

20628019 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20628019 is a deficient number, since it is larger than the sum of its proper divisors (779741).

20628019 is a wasteful number, since it uses less digits than its factorization.

20628019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20628019 is about 4541.8078999447. The cubic root of 20628019 is about 274.2537076807.

The spelling of 20628019 in words is "twenty million, six hundred twenty-eight thousand, nineteen".