19403780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{991}}^1$

素因数の和:1100

約数の個数: 48

約数和(自身を含む): 44997120

約数和(自身を除く): 25593340

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 89, 110, 178, 220, 356, 445, 890, 979, 991, 1780, 1958, 1982, 3916, 3964, 4895, 4955, 9790, 9910, 10901, 19580, 19820, 21802, 43604, 54505, 88199, 109010, 176398, 218020, 352796, 440995, 881990, 970189, 1763980, 1940378, 3880756, 4850945, 9701890, 19403780]

約数ペア:

[(1, 19403780), (2, 9701890), (4, 4850945), (5, 3880756), (10, 1940378), (11, 1763980), (20, 970189), (22, 881990), (44, 440995), (55, 352796), (89, 218020), (110, 176398), (178, 109010), (220, 88199), (356, 54505), (445, 43604), (890, 21802), (979, 19820), (991, 19580), (1780, 10901), (1958, 9910), (1982, 9790), (3916, 4955), (3964, 4895)]