20854988

素因数分解:

$2^2\times 7^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{569}}^1$

素因数の和:615

約数の個数: 72

約数和(自身を含む): 49124880

約数和(自身を除く): 28269892

約数列:

[1, 2, 4, 7, 11, 14, 17, 22, 28, 34, 44, 49, 68, 77, 98, 119, 154, 187, 196, 238, 308, 374, 476, 539, 569, 748, 833, 1078, 1138, 1309, 1666, 2156, 2276, 2618, 3332, 3983, 5236, 6259, 7966, 9163, 9673, 12518, 15932, 18326, 19346, 25036, 27881, 36652, 38692, 43813, 55762, 67711, 87626, 106403, 111524, 135422, 175252, 212806, 270844, 306691, 425612, 473977, 613382, 744821, 947954, 1226764, 1489642, 1895908, 2979284, 5213747, 10427494, 20854988]

約数ペア:

[(1, 20854988), (2, 10427494), (4, 5213747), (7, 2979284), (11, 1895908), (14, 1489642), (17, 1226764), (22, 947954), (28, 744821), (34, 613382), (44, 473977), (49, 425612), (68, 306691), (77, 270844), (98, 212806), (119, 175252), (154, 135422), (187, 111524), (196, 106403), (238, 87626), (308, 67711), (374, 55762), (476, 43813), (539, 38692), (569, 36652), (748, 27881), (833, 25036), (1078, 19346), (1138, 18326), (1309, 15932), (1666, 12518), (2156, 9673), (2276, 9163), (2618, 7966), (3332, 6259), (3983, 5236)]