20387700 has 108 divisors (see below), whose sum is σ = 66349920. Its totient is φ = 5430240.

The previous prime is 20387699. The next prime is 20387711. The reversal of 20387700 is 778302.

It is a tau number, because it is divible by the number of its divisors (108).

It is a super-2 number, since 2×20387700² = 831316622580000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23881 + ... + 24719.

Almost surely, 2^20387700 is an apocalyptic number.

20387700 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 20387700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33174960).

20387700 is an abundant number, since it is smaller than the sum of its proper divisors (45962220).

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

20387700 is a wasteful number, since it uses less digits than its factorization.

20387700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 20387700 is about 4515.2740780599. The cubic root of 20387700 is about 273.1845147986.

The spelling of 20387700 in words is "twenty million, three hundred eighty-seven thousand, seven hundred".