20429669 has 4 divisors (see below), whose sum is σ = 22001196. Its totient is φ = 18858144.

The previous prime is 20429663. The next prime is 20429711. The reversal of 20429669 is 96692402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2265025 + 18164644 = 1505^2 + 4262^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20429669 is a prime.

It is a super-2 number, since 2×20429669² = 834742750899122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20429663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785744 + ... + 785769.

It is an arithmetic number, because the mean of its divisors is an integer number (5500299).

Almost surely, 2^20429669 is an apocalyptic number.

It is an amenable number.

20429669 is a deficient number, since it is larger than the sum of its proper divisors (1571527).

20429669 is a wasteful number, since it uses less digits than its factorization.

20429669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571526.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 20429669 is about 4519.9191364448. The cubic root of 20429669 is about 273.3718405329.

It can be divided in two parts, 2042 and 9669, that added together give a palindrome (11711).

The spelling of 20429669 in words is "twenty million, four hundred twenty-nine thousand, six hundred sixty-nine".