20497950 has 144 divisors (see below), whose sum is σ = 62152272. Its totient is φ = 4800000.

The previous prime is 20497921. The next prime is 20497993. The reversal of 20497950 is 5979402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 202900 + ... + 203000.

It is an arithmetic number, because the mean of its divisors is an integer number (431613).

Almost surely, 2^20497950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20497950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31076136).

20497950 is an abundant number, since it is smaller than the sum of its proper divisors (41654322).

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

20497950 is a wasteful number, since it uses less digits than its factorization.

20497950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20497950 is about 4527.4661787804. The cubic root of 20497950 is about 273.6760605964.

It can be divided in two parts, 2049 and 7950, that added together give a palindrome (9999).

The spelling of 20497950 in words is "twenty million, four hundred ninety-seven thousand, nine hundred fifty".