640748720

素因数分解:

$2^4\times 5^1\times {\mathrm{23}}^1\times {\mathrm{479}}^1\times {\mathrm{727}}^1$

素因数の和:1242

約数の個数: 80

約数和(自身を含む): 1559900160

約数和(自身を除く): 919151440

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 40, 46, 80, 92, 115, 184, 230, 368, 460, 479, 727, 920, 958, 1454, 1840, 1916, 2395, 2908, 3635, 3832, 4790, 5816, 7270, 7664, 9580, 11017, 11632, 14540, 16721, 19160, 22034, 29080, 33442, 38320, 44068, 55085, 58160, 66884, 83605, 88136, 110170, 133768, 167210, 176272, 220340, 267536, 334420, 348233, 440680, 668840, 696466, 881360, 1337680, 1392932, 1741165, 2785864, 3482330, 5571728, 6964660, 8009359, 13929320, 16018718, 27858640, 32037436, 40046795, 64074872, 80093590, 128149744, 160187180, 320374360, 640748720]

約数ペア:

[(1, 640748720), (2, 320374360), (4, 160187180), (5, 128149744), (8, 80093590), (10, 64074872), (16, 40046795), (20, 32037436), (23, 27858640), (40, 16018718), (46, 13929320), (80, 8009359), (92, 6964660), (115, 5571728), (184, 3482330), (230, 2785864), (368, 1741165), (460, 1392932), (479, 1337680), (727, 881360), (920, 696466), (958, 668840), (1454, 440680), (1840, 348233), (1916, 334420), (2395, 267536), (2908, 220340), (3635, 176272), (3832, 167210), (4790, 133768), (5816, 110170), (7270, 88136), (7664, 83605), (9580, 66884), (11017, 58160), (11632, 55085), (14540, 44068), (16721, 38320), (19160, 33442), (22034, 29080)]