20498440

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{271}}^1$

素因数の和:374

約数の個数: 64

約数和(自身を含む): 48568320

約数和(自身を除く): 28069880

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 61, 62, 122, 124, 155, 244, 248, 271, 305, 310, 488, 542, 610, 620, 1084, 1220, 1240, 1355, 1891, 2168, 2440, 2710, 3782, 5420, 7564, 8401, 9455, 10840, 15128, 16531, 16802, 18910, 33062, 33604, 37820, 42005, 66124, 67208, 75640, 82655, 84010, 132248, 165310, 168020, 330620, 336040, 512461, 661240, 1024922, 2049844, 2562305, 4099688, 5124610, 10249220, 20498440]

約数ペア:

[(1, 20498440), (2, 10249220), (4, 5124610), (5, 4099688), (8, 2562305), (10, 2049844), (20, 1024922), (31, 661240), (40, 512461), (61, 336040), (62, 330620), (122, 168020), (124, 165310), (155, 132248), (244, 84010), (248, 82655), (271, 75640), (305, 67208), (310, 66124), (488, 42005), (542, 37820), (610, 33604), (620, 33062), (1084, 18910), (1220, 16802), (1240, 16531), (1355, 15128), (1891, 10840), (2168, 9455), (2440, 8401), (2710, 7564), (3782, 5420)]