20161500 has 48 divisors (see below), whose sum is σ = 58714656. Its totient is φ = 5376000.

The previous prime is 20161487. The next prime is 20161513. The reversal of 20161500 is 516102.

It is an interprime number because it is at equal distance from previous prime (20161487) and next prime (20161513).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20161500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5221 + ... + 8220.

It is an arithmetic number, because the mean of its divisors is an integer number (1223222).

Almost surely, 2^20161500 is an apocalyptic number.

20161500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20161500 is an abundant number, since it is smaller than the sum of its proper divisors (38553156).

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

20161500 is a wasteful number, since it uses less digits than its factorization.

20161500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13463 (or 13451 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20161500 is about 4490.1558992979. The cubic root of 20161500 is about 272.1704345621.

Adding to 20161500 its reverse (516102), we get a palindrome (20677602).

The spelling of 20161500 in words is "twenty million, one hundred sixty-one thousand, five hundred".