20390700 has 144 divisors (see below), whose sum is σ = 66495744. Its totient is φ = 4780800.

The previous prime is 20390681. The next prime is 20390707. The reversal of 20390700 is 709302.

It is not an unprimeable number, because it can be changed into a prime (20390707) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 122017 + ... + 122183.

It is an arithmetic number, because the mean of its divisors is an integer number (461776).

Almost surely, 2^20390700 is an apocalyptic number.

20390700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20390700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33247872).

20390700 is an abundant number, since it is smaller than the sum of its proper divisors (46105044).

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

20390700 is a wasteful number, since it uses less digits than its factorization.

20390700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 20390700 is about 4515.6062715875. The cubic root of 20390700 is about 273.1979136183.

The spelling of 20390700 in words is "twenty million, three hundred ninety thousand, seven hundred".