20629418 has 4 divisors (see below), whose sum is σ = 30944130. Its totient is φ = 10314708.

The previous prime is 20629417. The next prime is 20629429. The reversal of 20629418 is 81492602.

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., 10975969 + 9653449 = 3313^2 + 3107^2 .

It is not an unprimeable number, because it can be changed into a prime (20629417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5157353 + ... + 5157356.

Almost surely, 2^20629418 is an apocalyptic number.

20629418 is a deficient number, since it is larger than the sum of its proper divisors (10314712).

20629418 is a wasteful number, since it uses less digits than its factorization.

20629418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10314711.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 20629418 is about 4541.9619108927. The cubic root of 20629418 is about 274.2599075371.

The spelling of 20629418 in words is "twenty million, six hundred twenty-nine thousand, four hundred eighteen".