21238720

素因数分解:

$2^6\times 5^1\times {\mathrm{31}}^1\times {\mathrm{2141}}^1$

素因数の和:2189

約数の個数: 56

約数和(自身を含む): 52230528

約数和(自身を除く): 30991808

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 155, 160, 248, 310, 320, 496, 620, 992, 1240, 1984, 2141, 2480, 4282, 4960, 8564, 9920, 10705, 17128, 21410, 34256, 42820, 66371, 68512, 85640, 132742, 137024, 171280, 265484, 331855, 342560, 530968, 663710, 685120, 1061936, 1327420, 2123872, 2654840, 4247744, 5309680, 10619360, 21238720]

約数ペア:

[(1, 21238720), (2, 10619360), (4, 5309680), (5, 4247744), (8, 2654840), (10, 2123872), (16, 1327420), (20, 1061936), (31, 685120), (32, 663710), (40, 530968), (62, 342560), (64, 331855), (80, 265484), (124, 171280), (155, 137024), (160, 132742), (248, 85640), (310, 68512), (320, 66371), (496, 42820), (620, 34256), (992, 21410), (1240, 17128), (1984, 10705), (2141, 9920), (2480, 8564), (4282, 4960)]