21205980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{117811}}^1$

素因数の和:117826

約数の個数: 36

約数和(自身を含む): 64325352

約数和(自身を除く): 43119372

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 117811, 235622, 353433, 471244, 589055, 706866, 1060299, 1178110, 1413732, 1767165, 2120598, 2356220, 3534330, 4241196, 5301495, 7068660, 10602990, 21205980]

約数ペア:

[(1, 21205980), (2, 10602990), (3, 7068660), (4, 5301495), (5, 4241196), (6, 3534330), (9, 2356220), (10, 2120598), (12, 1767165), (15, 1413732), (18, 1178110), (20, 1060299), (30, 706866), (36, 589055), (45, 471244), (60, 353433), (90, 235622), (180, 117811)]