20101040 has 20 divisors (see below), whose sum is σ = 46735104. Its totient is φ = 8040384.

The previous prime is 20101013. The next prime is 20101073. The reversal of 20101040 is 4010102.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (8).

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 3 ways as a sum of consecutive naturals, for example, 125552 + ... + 125711.

Almost surely, 2^20101040 is an apocalyptic number.

20101040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101040 is an abundant number, since it is smaller than the sum of its proper divisors (26634064).

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

20101040 is a wasteful number, since it uses less digits than its factorization.

20101040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251276 (or 251270 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 20101040 is about 4483.4183387233. The cubic root of 20101040 is about 271.8981019696.

Adding to 20101040 its reverse (4010102), we get a palindrome (24111142).

The spelling of 20101040 in words is "twenty million, one hundred one thousand, forty".