20818426 has 4 divisors (see below), whose sum is σ = 31227642. Its totient is φ = 10409212.

The previous prime is 20818409. The next prime is 20818459. The reversal of 20818426 is 62481802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13801225 + 7017201 = 3715^2 + 2649^2 .

It is a super-2 number, since 2×20818426² = 866813722234952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5204605 + ... + 5204608.

Almost surely, 2^20818426 is an apocalyptic number.

20818426 is a deficient number, since it is larger than the sum of its proper divisors (10409216).

20818426 is a wasteful number, since it uses less digits than its factorization.

20818426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10409215.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 20818426 is about 4562.7213370970. The cubic root of 20818426 is about 275.0949578408.

The spelling of 20818426 in words is "twenty million, eight hundred eighteen thousand, four hundred twenty-six".