20621042 has 30 divisors (see below), whose sum is σ = 35365563. Its totient is φ = 9016488.

The previous prime is 20621009. The next prime is 20621063. The reversal of 20621042 is 24012602.

It can be written as a sum of positive squares in 3 ways, for example, as 361 + 20620681 = 19^2 + 4541^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3211.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20621042.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1085309 + ... + 1085327.

Almost surely, 2^20621042 is an apocalyptic number.

20621042 is a deficient number, since it is larger than the sum of its proper divisors (14744521).

20621042 is an frugal number, since it uses more digits than its factorization.

20621042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20621042 is about 4541.0397487800. The cubic root of 20621042 is about 274.2227839827. Note that the first 3 decimals are identical.

Adding to 20621042 its reverse (24012602), we get a palindrome (44633644).

The spelling of 20621042 in words is "twenty million, six hundred twenty-one thousand, forty-two".