20621026 has 4 divisors (see below), whose sum is σ = 30931542. Its totient is φ = 10310512.

The previous prime is 20621009. The next prime is 20621063. The reversal of 20621026 is 62012602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62012602 = 2 ⋅31006301.

It can be written as a sum of positive squares in only one way, i.e., 15563025 + 5058001 = 3945^2 + 2249^2 .

It is a super-3 number, since 3×20621026³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20620994 and 20621012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5155255 + ... + 5155258.

Almost surely, 2^20621026 is an apocalyptic number.

20621026 is a deficient number, since it is larger than the sum of its proper divisors (10310516).

20621026 is a wasteful number, since it uses less digits than its factorization.

20621026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10310515.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20621026 is about 4541.0379870686. The cubic root of 20621026 is about 274.2227130590. Note that the first 3 decimals are identical.

Adding to 20621026 its reverse (62012602), we get a palindrome (82633628).

The spelling of 20621026 in words is "twenty million, six hundred twenty-one thousand, twenty-six".