20919520

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{7691}}^1$

素因数の和:7723

約数の個数: 48

約数和(自身を含む): 52336368

約数和(自身を除く): 31416848

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, 7691, 15382, 30764, 38455, 61528, 76910, 123056, 130747, 153820, 246112, 261494, 307640, 522988, 615280, 653735, 1045976, 1230560, 1307470, 2091952, 2614940, 4183904, 5229880, 10459760, 20919520]

約数ペア:

[(1, 20919520), (2, 10459760), (4, 5229880), (5, 4183904), (8, 2614940), (10, 2091952), (16, 1307470), (17, 1230560), (20, 1045976), (32, 653735), (34, 615280), (40, 522988), (68, 307640), (80, 261494), (85, 246112), (136, 153820), (160, 130747), (170, 123056), (272, 76910), (340, 61528), (544, 38455), (680, 30764), (1360, 15382), (2720, 7691)]