19990040

素因数分解:

$2^3\times 5^1\times 7^3\times {\mathrm{31}}^1\times {\mathrm{47}}^1$

素因数の和:110

約数の個数: 128

約数和(自身を含む): 55296000

約数和(自身を除く): 35305960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 31, 35, 40, 47, 49, 56, 62, 70, 94, 98, 124, 140, 155, 188, 196, 217, 235, 245, 248, 280, 310, 329, 343, 376, 392, 434, 470, 490, 620, 658, 686, 868, 940, 980, 1085, 1240, 1316, 1372, 1457, 1519, 1645, 1715, 1736, 1880, 1960, 2170, 2303, 2632, 2744, 2914, 3038, 3290, 3430, 4340, 4606, 5828, 6076, 6580, 6860, 7285, 7595, 8680, 9212, 10199, 10633, 11515, 11656, 12152, 13160, 13720, 14570, 15190, 16121, 18424, 20398, 21266, 23030, 29140, 30380, 32242, 40796, 42532, 46060, 50995, 53165, 58280, 60760, 64484, 71393, 80605, 81592, 85064, 92120, 101990, 106330, 128968, 142786, 161210, 203980, 212660, 285572, 322420, 356965, 407960, 425320, 499751, 571144, 644840, 713930, 999502, 1427860, 1999004, 2498755, 2855720, 3998008, 4997510, 9995020, 19990040]

約数ペア:

[(1, 19990040), (2, 9995020), (4, 4997510), (5, 3998008), (7, 2855720), (8, 2498755), (10, 1999004), (14, 1427860), (20, 999502), (28, 713930), (31, 644840), (35, 571144), (40, 499751), (47, 425320), (49, 407960), (56, 356965), (62, 322420), (70, 285572), (94, 212660), (98, 203980), (124, 161210), (140, 142786), (155, 128968), (188, 106330), (196, 101990), (217, 92120), (235, 85064), (245, 81592), (248, 80605), (280, 71393), (310, 64484), (329, 60760), (343, 58280), (376, 53165), (392, 50995), (434, 46060), (470, 42532), (490, 40796), (620, 32242), (658, 30380), (686, 29140), (868, 23030), (940, 21266), (980, 20398), (1085, 18424), (1240, 16121), (1316, 15190), (1372, 14570), (1457, 13720), (1519, 13160), (1645, 12152), (1715, 11656), (1736, 11515), (1880, 10633), (1960, 10199), (2170, 9212), (2303, 8680), (2632, 7595), (2744, 7285), (2914, 6860), (3038, 6580), (3290, 6076), (3430, 5828), (4340, 4606)]