20389620 has 24 divisors (see below), whose sum is σ = 57091104. Its totient is φ = 5437216.

The previous prime is 20389619. The next prime is 20389631. The reversal of 20389620 is 2698302.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169854 + ... + 169973.

It is an arithmetic number, because the mean of its divisors is an integer number (2378796).

Almost surely, 2^20389620 is an apocalyptic number.

20389620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20389620 is an abundant number, since it is smaller than the sum of its proper divisors (36701484).

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

20389620 is a wasteful number, since it uses less digits than its factorization.

20389620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339839 (or 339837 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20389620 is about 4515.4866847329. The cubic root of 20389620 is about 273.1930901946.

The spelling of 20389620 in words is "twenty million, three hundred eighty-nine thousand, six hundred twenty".