20629697 has 4 divisors (see below), whose sum is σ = 22505136. Its totient is φ = 18754260.

The previous prime is 20629691. The next prime is 20629699. The reversal of 20629697 is 79692602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20629697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20629691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 937703 + ... + 937724.

It is an arithmetic number, because the mean of its divisors is an integer number (5626284).

Almost surely, 2^20629697 is an apocalyptic number.

It is an amenable number.

20629697 is a deficient number, since it is larger than the sum of its proper divisors (1875439).

20629697 is a wasteful number, since it uses less digits than its factorization.

20629697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875438.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 20629697 is about 4541.9926243886. The cubic root of 20629697 is about 274.2611439295.

The spelling of 20629697 in words is "twenty million, six hundred twenty-nine thousand, six hundred ninety-seven".