20215044 has 18 divisors (see below), whose sum is σ = 51099230. Its totient is φ = 6738336.

The previous prime is 20215037. The next prime is 20215093. The reversal of 20215044 is 44051202.

20215044 = 192² + 193² + ... + 407².

It can be written as a sum of positive squares in only one way, i.e., 20142144 + 72900 = 4488^2 + 270^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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, 280729 + ... + 280800.

Almost surely, 2^20215044 is an apocalyptic number.

It is an amenable number.

20215044 is an abundant number, since it is smaller than the sum of its proper divisors (30884186).

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

20215044 is a wasteful number, since it uses less digits than its factorization.

20215044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561539 (or 561534 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20215044 is about 4496.1143223899. The cubic root of 20215044 is about 272.4111608952.

Adding to 20215044 its reverse (44051202), we get a palindrome (64266246).

The spelling of 20215044 in words is "twenty million, two hundred fifteen thousand, forty-four".