20122500 has 60 divisors (see below), whose sum is σ = 58693712. Its totient is φ = 5364000.

The previous prime is 20122499. The next prime is 20122511. The reversal of 20122500 is 522102.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6159 + ... + 8841.

Almost surely, 2^20122500 is an apocalyptic number.

20122500 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 20122500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29346856).

20122500 is an abundant number, since it is smaller than the sum of its proper divisors (38571212).

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

20122500 is a wasteful number, since it uses less digits than its factorization.

20122500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2710 (or 2693 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20122500 is about 4485.8109634714. The cubic root of 20122500 is about 271.9948276121.

Adding to 20122500 its reverse (522102), we get a palindrome (20644602).

The spelling of 20122500 in words is "twenty million, one hundred twenty-two thousand, five hundred".