21511120

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15817}}^1$

素因数の和:15847

約数の個数: 40

約数和(自身を含む): 52958664

約数和(自身を除く): 31447544

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15817, 31634, 63268, 79085, 126536, 158170, 253072, 268889, 316340, 537778, 632680, 1075556, 1265360, 1344445, 2151112, 2688890, 4302224, 5377780, 10755560, 21511120]

約数ペア:

[(1, 21511120), (2, 10755560), (4, 5377780), (5, 4302224), (8, 2688890), (10, 2151112), (16, 1344445), (17, 1265360), (20, 1075556), (34, 632680), (40, 537778), (68, 316340), (80, 268889), (85, 253072), (136, 158170), (170, 126536), (272, 79085), (340, 63268), (680, 31634), (1360, 15817)]