20398950 has 144 divisors (see below), whose sum is σ = 64589616. Its totient is φ = 4550400.

The previous prime is 20398921. The next prime is 20398967. The reversal of 20398950 is 5989302.

It is a super-2 number, since 2×20398950² = 832234322205000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 64192 + ... + 64508.

It is an arithmetic number, because the mean of its divisors is an integer number (448539).

Almost surely, 2^20398950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20398950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32294808).

20398950 is an abundant number, since it is smaller than the sum of its proper divisors (44190666).

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

20398950 is a wasteful number, since it uses less digits than its factorization.

20398950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20398950 is about 4516.5196778050. The cubic root of 20398950 is about 273.2347535974.

The spelling of 20398950 in words is "twenty million, three hundred ninety-eight thousand, nine hundred fifty".