20642453 has 8 divisors (see below), whose sum is σ = 22407168. Its totient is φ = 18903024.

The previous prime is 20642449. The next prime is 20642467. The reversal of 20642453 is 35424602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20642453 - 2² = 20642449 is a prime.

It is a super-2 number, since 2×20642453² = 852221731714418, 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 (20642423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4601 + ... + 7902.

It is an arithmetic number, because the mean of its divisors is an integer number (2800896).

Almost surely, 2^20642453 is an apocalyptic number.

It is an amenable number.

20642453 is a deficient number, since it is larger than the sum of its proper divisors (1764715).

20642453 is a wasteful number, since it uses less digits than its factorization.

20642453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12643.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 20642453 is about 4543.3966368786. The cubic root of 20642453 is about 274.3176604217.

The spelling of 20642453 in words is "twenty million, six hundred forty-two thousand, four hundred fifty-three".