20990240

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{7717}}^1$

素因数の和:7749

約数の個数: 48

約数和(自身を含む): 52513272

約数和(自身を除く): 31523032

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 68, 80, 85, 136, 160, 170, 272, 340, 544, 680, 1360, 2720, 7717, 15434, 30868, 38585, 61736, 77170, 123472, 131189, 154340, 246944, 262378, 308680, 524756, 617360, 655945, 1049512, 1234720, 1311890, 2099024, 2623780, 4198048, 5247560, 10495120, 20990240]

約数ペア:

[(1, 20990240), (2, 10495120), (4, 5247560), (5, 4198048), (8, 2623780), (10, 2099024), (16, 1311890), (17, 1234720), (20, 1049512), (32, 655945), (34, 617360), (40, 524756), (68, 308680), (80, 262378), (85, 246944), (136, 154340), (160, 131189), (170, 123472), (272, 77170), (340, 61736), (544, 38585), (680, 30868), (1360, 15434), (2720, 7717)]