20604040 has 32 divisors (see below), whose sum is σ = 46500480. Its totient is φ = 8216512.

The previous prime is 20604019. The next prime is 20604047. The reversal of 20604040 is 4040602.

20604040 = 1165² + 1166² + ... + 1179².

It is not an unprimeable number, because it can be changed into a prime (20604047) 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, 18129 + ... + 19231.

It is an arithmetic number, because the mean of its divisors is an integer number (1453140).

Almost surely, 2^20604040 is an apocalyptic number.

20604040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20604040 is an abundant number, since it is smaller than the sum of its proper divisors (25896440).

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

20604040 is a wasteful number, since it uses less digits than its factorization.

20604040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581 (or 1577 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20604040 is about 4539.1673245211. The cubic root of 20604040 is about 274.1473979164.

Adding to 20604040 its reverse (4040602), we get a palindrome (24644642).

The spelling of 20604040 in words is "twenty million, six hundred four thousand, forty".