20641700 has 36 divisors (see below), whose sum is σ = 45122112. Its totient is φ = 8196000.

The previous prime is 20641679. The next prime is 20641717. The reversal of 20641700 is 714602.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14417 + ... + 15783.

It is an arithmetic number, because the mean of its divisors is an integer number (1253392).

Almost surely, 2^20641700 is an apocalyptic number.

20641700 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 20641700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22561056).

20641700 is an abundant number, since it is smaller than the sum of its proper divisors (24480412).

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

20641700 is a wasteful number, since it uses less digits than its factorization.

20641700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532 (or 1525 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20641700 is about 4543.3137686055. The cubic root of 20641700 is about 274.3143248409.

The spelling of 20641700 in words is "twenty million, six hundred forty-one thousand, seven hundred".