20501004 has 24 divisors (see below), whose sum is σ = 49916160. Its totient is φ = 6536464.

The previous prime is 20500973. The next prime is 20501009. The reversal of 20501004 is 40010502.

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

It is not an unprimeable number, because it can be changed into a prime (20501009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36864 + ... + 37415.

It is an arithmetic number, because the mean of its divisors is an integer number (2079840).

Almost surely, 2^20501004 is an apocalyptic number.

It is an amenable number.

20501004 is an abundant number, since it is smaller than the sum of its proper divisors (29415156).

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

20501004 is a wasteful number, since it uses less digits than its factorization.

20501004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74309 (or 74307 counting only the distinct ones).

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

The square root of 20501004 is about 4527.8034409634. The cubic root of 20501004 is about 273.6896516332.

Adding to 20501004 its reverse (40010502), we get a palindrome (60511506).

The spelling of 20501004 in words is "twenty million, five hundred one thousand, four".