21004980

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{491}}^1$

素因数の和:557

約数の個数: 96

約数和(自身を含む): 63479808

約数和(自身を除く): 42474828

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 23, 30, 31, 46, 60, 62, 69, 92, 93, 115, 124, 138, 155, 186, 230, 276, 310, 345, 372, 460, 465, 491, 620, 690, 713, 930, 982, 1380, 1426, 1473, 1860, 1964, 2139, 2455, 2852, 2946, 3565, 4278, 4910, 5892, 7130, 7365, 8556, 9820, 10695, 11293, 14260, 14730, 15221, 21390, 22586, 29460, 30442, 33879, 42780, 45172, 45663, 56465, 60884, 67758, 76105, 91326, 112930, 135516, 152210, 169395, 182652, 225860, 228315, 304420, 338790, 350083, 456630, 677580, 700166, 913260, 1050249, 1400332, 1750415, 2100498, 3500830, 4200996, 5251245, 7001660, 10502490, 21004980]

約数ペア:

[(1, 21004980), (2, 10502490), (3, 7001660), (4, 5251245), (5, 4200996), (6, 3500830), (10, 2100498), (12, 1750415), (15, 1400332), (20, 1050249), (23, 913260), (30, 700166), (31, 677580), (46, 456630), (60, 350083), (62, 338790), (69, 304420), (92, 228315), (93, 225860), (115, 182652), (124, 169395), (138, 152210), (155, 135516), (186, 112930), (230, 91326), (276, 76105), (310, 67758), (345, 60884), (372, 56465), (460, 45663), (465, 45172), (491, 42780), (620, 33879), (690, 30442), (713, 29460), (930, 22586), (982, 21390), (1380, 15221), (1426, 14730), (1473, 14260), (1860, 11293), (1964, 10695), (2139, 9820), (2455, 8556), (2852, 7365), (2946, 7130), (3565, 5892), (4278, 4910)]