20963440

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{107}}^1$

素因数の和:230

約数の個数: 80

約数和(自身を含む): 51425280

約数和(自身を除く): 30461840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 79, 80, 107, 124, 155, 158, 214, 248, 310, 316, 395, 428, 496, 535, 620, 632, 790, 856, 1070, 1240, 1264, 1580, 1712, 2140, 2449, 2480, 3160, 3317, 4280, 4898, 6320, 6634, 8453, 8560, 9796, 12245, 13268, 16585, 16906, 19592, 24490, 26536, 33170, 33812, 39184, 42265, 48980, 53072, 66340, 67624, 84530, 97960, 132680, 135248, 169060, 195920, 262043, 265360, 338120, 524086, 676240, 1048172, 1310215, 2096344, 2620430, 4192688, 5240860, 10481720, 20963440]

約数ペア:

[(1, 20963440), (2, 10481720), (4, 5240860), (5, 4192688), (8, 2620430), (10, 2096344), (16, 1310215), (20, 1048172), (31, 676240), (40, 524086), (62, 338120), (79, 265360), (80, 262043), (107, 195920), (124, 169060), (155, 135248), (158, 132680), (214, 97960), (248, 84530), (310, 67624), (316, 66340), (395, 53072), (428, 48980), (496, 42265), (535, 39184), (620, 33812), (632, 33170), (790, 26536), (856, 24490), (1070, 19592), (1240, 16906), (1264, 16585), (1580, 13268), (1712, 12245), (2140, 9796), (2449, 8560), (2480, 8453), (3160, 6634), (3317, 6320), (4280, 4898)]