20420920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{173}}^1\times {\mathrm{227}}^1$

素因数の和:424

約数の個数: 64

約数和(自身を含む): 49986720

約数和(自身を除く): 29565800

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 173, 227, 260, 346, 454, 520, 692, 865, 908, 1135, 1384, 1730, 1816, 2249, 2270, 2951, 3460, 4498, 4540, 5902, 6920, 8996, 9080, 11245, 11804, 14755, 17992, 22490, 23608, 29510, 39271, 44980, 59020, 78542, 89960, 118040, 157084, 196355, 314168, 392710, 510523, 785420, 1021046, 1570840, 2042092, 2552615, 4084184, 5105230, 10210460, 20420920]

約数ペア:

[(1, 20420920), (2, 10210460), (4, 5105230), (5, 4084184), (8, 2552615), (10, 2042092), (13, 1570840), (20, 1021046), (26, 785420), (40, 510523), (52, 392710), (65, 314168), (104, 196355), (130, 157084), (173, 118040), (227, 89960), (260, 78542), (346, 59020), (454, 44980), (520, 39271), (692, 29510), (865, 23608), (908, 22490), (1135, 17992), (1384, 14755), (1730, 11804), (1816, 11245), (2249, 9080), (2270, 8996), (2951, 6920), (3460, 5902), (4498, 4540)]