21617620

素因数分解:

$2^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{131}}^1\times {\mathrm{223}}^1$

素因数の和:400

約数の個数: 48

約数和(自身を含む): 47190528

約数和(自身を除く): 25572908

約数列:

[1, 2, 4, 5, 10, 20, 37, 74, 131, 148, 185, 223, 262, 370, 446, 524, 655, 740, 892, 1115, 1310, 2230, 2620, 4460, 4847, 8251, 9694, 16502, 19388, 24235, 29213, 33004, 41255, 48470, 58426, 82510, 96940, 116852, 146065, 165020, 292130, 584260, 1080881, 2161762, 4323524, 5404405, 10808810, 21617620]

約数ペア:

[(1, 21617620), (2, 10808810), (4, 5404405), (5, 4323524), (10, 2161762), (20, 1080881), (37, 584260), (74, 292130), (131, 165020), (148, 146065), (185, 116852), (223, 96940), (262, 82510), (370, 58426), (446, 48470), (524, 41255), (655, 33004), (740, 29213), (892, 24235), (1115, 19388), (1310, 16502), (2230, 9694), (2620, 8251), (4460, 4847)]