20215511004 has 144 divisors (see below), whose sum is σ = 52563574784. Its totient is φ = 6010744320.

The previous prime is 20215510993. The next prime is 20215511011. The reversal of 20215511004 is 40011551202.

It is a super-3 number, since 3×20215511004³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33303669 + ... + 33304275.

Almost surely, 2^20215511004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20215511004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26281787392).

20215511004 is an abundant number, since it is smaller than the sum of its proper divisors (32348063780).

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

20215511004 is a wasteful number, since it uses less digits than its factorization.

20215511004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836 (or 793 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The spelling of 20215511004 in words is "twenty billion, two hundred fifteen million, five hundred eleven thousand, four".