20619102 has 64 divisors (see below), whose sum is σ = 49420800. Its totient is φ = 5729472.

The previous prime is 20619089. The next prime is 20619103. The reversal of 20619102 is 20191602.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20619103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88378 + ... + 88610.

It is an arithmetic number, because the mean of its divisors is an integer number (772200).

Almost surely, 2^20619102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20619102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24710400).

20619102 is an abundant number, since it is smaller than the sum of its proper divisors (28801698).

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

20619102 is a wasteful number, since it uses less digits than its factorization.

20619102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 20619102 is about 4540.8261362884. The cubic root of 20619102 is about 274.2141842090.

The spelling of 20619102 in words is "twenty million, six hundred nineteen thousand, one hundred two".