20628829 has 8 divisors (see below), whose sum is σ = 22256640. Its totient is φ = 19006896.

The previous prime is 20628823. The next prime is 20628859. The reversal of 20628829 is 92882602.

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 20628829 - 2³ = 20628821 is a prime.

It is a super-2 number, since 2×20628829² = 851097171822482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20628821) 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, 8244 + ... + 10450.

It is an arithmetic number, because the mean of its divisors is an integer number (2782080).

Almost surely, 2^20628829 is an apocalyptic number.

It is an amenable number.

20628829 is a deficient number, since it is larger than the sum of its proper divisors (1627811).

20628829 is a wasteful number, since it uses less digits than its factorization.

20628829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2939.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 20628829 is about 4541.8970706083. The cubic root of 20628829 is about 274.2572973386.

It can be divided in two parts, 20 and 628829, that added together give a square (628849 = 793²).

The spelling of 20628829 in words is "twenty million, six hundred twenty-eight thousand, eight hundred twenty-nine".