21570040

素因数分解:

$2^3\times 5^1\times {\mathrm{73}}^1\times {\mathrm{83}}^1\times {\mathrm{89}}^1$

素因数の和:256

約数の個数: 64

約数和(自身を含む): 50349600

約数和(自身を除く): 28779560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 73, 83, 89, 146, 166, 178, 292, 332, 356, 365, 415, 445, 584, 664, 712, 730, 830, 890, 1460, 1660, 1780, 2920, 3320, 3560, 6059, 6497, 7387, 12118, 12994, 14774, 24236, 25988, 29548, 30295, 32485, 36935, 48472, 51976, 59096, 60590, 64970, 73870, 121180, 129940, 147740, 242360, 259880, 295480, 539251, 1078502, 2157004, 2696255, 4314008, 5392510, 10785020, 21570040]

約数ペア:

[(1, 21570040), (2, 10785020), (4, 5392510), (5, 4314008), (8, 2696255), (10, 2157004), (20, 1078502), (40, 539251), (73, 295480), (83, 259880), (89, 242360), (146, 147740), (166, 129940), (178, 121180), (292, 73870), (332, 64970), (356, 60590), (365, 59096), (415, 51976), (445, 48472), (584, 36935), (664, 32485), (712, 30295), (730, 29548), (830, 25988), (890, 24236), (1460, 14774), (1660, 12994), (1780, 12118), (2920, 7387), (3320, 6497), (3560, 6059)]