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20420450 = 2521492741
BaseRepresentation
bin100110111100…
…1011101100010
31102102110120222
41031321131202
520211423300
62005403042
7335366561
oct115713542
942373528
1020420450
1110588206
126a09482
1342cc90b
1429d7bd8
151bd5785
hex1379762

20420450 has 24 divisors (see below), whose sum is σ = 38250900. Its totient is φ = 8110400.

The previous prime is 20420443. The next prime is 20420453. The reversal of 20420450 is 5402402.

It can be written as a sum of positive squares in 6 ways, for example, as 2024929 + 18395521 = 1423^2 + 4289^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20420453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6080 + ... + 8820.

Almost surely, 220420450 is an apocalyptic number.

20420450 is a deficient number, since it is larger than the sum of its proper divisors (17830450).

20420450 is a wasteful number, since it uses less digits than its factorization.

20420450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902 (or 2897 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 20420450 is about 4518.8992022394. The cubic root of 20420450 is about 273.3307141662.

Adding to 20420450 its reverse (5402402), we get a palindrome (25822852).

The spelling of 20420450 in words is "twenty million, four hundred twenty thousand, four hundred fifty".

Divisors: 1 2 5 10 25 50 149 298 745 1490 2741 3725 5482 7450 13705 27410 68525 137050 408409 816818 2042045 4084090 10210225 20420450