20457633 has 32 divisors (see below), whose sum is σ = 32438016. Its totient is φ = 11225088.

The previous prime is 20457617. The next prime is 20457677. The reversal of 20457633 is 33675402.

It is not a de Polignac number, because 20457633 - 2⁴ = 20457617 is a prime.

It is a super-4 number, since 4×20457633⁴ (a number of 30 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20457633.

It is not an unprimeable number, because it can be changed into a prime (20457133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87685 + ... + 87917.

It is an arithmetic number, because the mean of its divisors is an integer number (1013688).

Almost surely, 2^20457633 is an apocalyptic number.

It is an amenable number.

20457633 is a deficient number, since it is larger than the sum of its proper divisors (11980383).

20457633 is a wasteful number, since it uses less digits than its factorization.

20457633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393.

The product of its (nonzero) digits is 15120, while the sum is 30.

The square root of 20457633 is about 4523.0114967796. The cubic root of 20457633 is about 273.4965135408.

The spelling of 20457633 in words is "twenty million, four hundred fifty-seven thousand, six hundred thirty-three".