20629453 has 4 divisors (see below), whose sum is σ = 22216348. Its totient is φ = 19042560.

The previous prime is 20629447. The next prime is 20629463. The reversal of 20629453 is 35492602.

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 7064964 + 13564489 = 2658^2 + 3683^2 .

It is a cyclic number.

It is not a de Polignac number, because 20629453 - 2¹³ = 20621261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20629463) 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, 793428 + ... + 793453.

It is an arithmetic number, because the mean of its divisors is an integer number (5554087).

Almost surely, 2^20629453 is an apocalyptic number.

It is an amenable number.

20629453 is a deficient number, since it is larger than the sum of its proper divisors (1586895).

20629453 is a wasteful number, since it uses less digits than its factorization.

20629453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586894.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 20629453 is about 4541.9657638516. The cubic root of 20629453 is about 274.2600626407.

The spelling of 20629453 in words is "twenty million, six hundred twenty-nine thousand, four hundred fifty-three".