640934980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{240953}}^1$

素因数の和:240988

約数の個数: 48

約数和(自身を含む): 1619210880

約数和(自身を除く): 978275900

約数列:

[1, 2, 4, 5, 7, 10, 14, 19, 20, 28, 35, 38, 70, 76, 95, 133, 140, 190, 266, 380, 532, 665, 1330, 2660, 240953, 481906, 963812, 1204765, 1686671, 2409530, 3373342, 4578107, 4819060, 6746684, 8433355, 9156214, 16866710, 18312428, 22890535, 32046749, 33733420, 45781070, 64093498, 91562140, 128186996, 160233745, 320467490, 640934980]

約数ペア:

[(1, 640934980), (2, 320467490), (4, 160233745), (5, 128186996), (7, 91562140), (10, 64093498), (14, 45781070), (19, 33733420), (20, 32046749), (28, 22890535), (35, 18312428), (38, 16866710), (70, 9156214), (76, 8433355), (95, 6746684), (133, 4819060), (140, 4578107), (190, 3373342), (266, 2409530), (380, 1686671), (532, 1204765), (665, 963812), (1330, 481906), (2660, 240953)]