20415521232004 has 18 divisors (see below), whose sum is σ = 36619809884042. Its totient is φ = 9958790841600.

The previous prime is 20415521231981. The next prime is 20415521232049. The reversal of 20415521232004 is 40023212551402.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 5456185879104 + 14959335352900 = 2335848^2 + 3867730^2 .

It is a super-2 number, since 2×20415521232004² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1518101637 + ... + 1518115084.

Almost surely, 2^{20415521232004} is an apocalyptic number.

It is an amenable number.

20415521232004 is a deficient number, since it is larger than the sum of its proper divisors (16204288652038).

20415521232004 is a wasteful number, since it uses less digits than its factorization.

20415521232004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036216807 (or 3036216764 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 20415521232004 its reverse (40023212551402), we get a palindrome (60438733783406).

The spelling of 20415521232004 in words is "twenty trillion, four hundred fifteen billion, five hundred twenty-one million, two hundred thirty-two thousand, four".