21259520

素因数分解:

$2^8\times 5^1\times {\mathrm{17}}^1\times {\mathrm{977}}^1$

素因数の和:1015

約数の個数: 72

約数和(自身を含む): 53973864

約数和(自身を除く): 32714344

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 64, 68, 80, 85, 128, 136, 160, 170, 256, 272, 320, 340, 544, 640, 680, 977, 1088, 1280, 1360, 1954, 2176, 2720, 3908, 4352, 4885, 5440, 7816, 9770, 10880, 15632, 16609, 19540, 21760, 31264, 33218, 39080, 62528, 66436, 78160, 83045, 125056, 132872, 156320, 166090, 250112, 265744, 312640, 332180, 531488, 625280, 664360, 1062976, 1250560, 1328720, 2125952, 2657440, 4251904, 5314880, 10629760, 21259520]

約数ペア:

[(1, 21259520), (2, 10629760), (4, 5314880), (5, 4251904), (8, 2657440), (10, 2125952), (16, 1328720), (17, 1250560), (20, 1062976), (32, 664360), (34, 625280), (40, 531488), (64, 332180), (68, 312640), (80, 265744), (85, 250112), (128, 166090), (136, 156320), (160, 132872), (170, 125056), (256, 83045), (272, 78160), (320, 66436), (340, 62528), (544, 39080), (640, 33218), (680, 31264), (977, 21760), (1088, 19540), (1280, 16609), (1360, 15632), (1954, 10880), (2176, 9770), (2720, 7816), (3908, 5440), (4352, 4885)]