21005320

素因数分解:

$2^3\times 5^1\times 7^3\times {\mathrm{1531}}^1$

素因数の和:1563

約数の個数: 64

約数和(自身を含む): 55152000

約数和(自身を除く): 34146680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 343, 392, 490, 686, 980, 1372, 1531, 1715, 1960, 2744, 3062, 3430, 6124, 6860, 7655, 10717, 12248, 13720, 15310, 21434, 30620, 42868, 53585, 61240, 75019, 85736, 107170, 150038, 214340, 300076, 375095, 428680, 525133, 600152, 750190, 1050266, 1500380, 2100532, 2625665, 3000760, 4201064, 5251330, 10502660, 21005320]

約数ペア:

[(1, 21005320), (2, 10502660), (4, 5251330), (5, 4201064), (7, 3000760), (8, 2625665), (10, 2100532), (14, 1500380), (20, 1050266), (28, 750190), (35, 600152), (40, 525133), (49, 428680), (56, 375095), (70, 300076), (98, 214340), (140, 150038), (196, 107170), (245, 85736), (280, 75019), (343, 61240), (392, 53585), (490, 42868), (686, 30620), (980, 21434), (1372, 15310), (1531, 13720), (1715, 12248), (1960, 10717), (2744, 7655), (3062, 6860), (3430, 6124)]