19916420

素因数分解:

$2^2\times 5^1\times {\mathrm{67}}^1\times {\mathrm{89}}^1\times {\mathrm{167}}^1$

素因数の和:332

約数の個数: 48

約数和(自身を含む): 43182720

約数和(自身を除く): 23266300

約数列:

[1, 2, 4, 5, 10, 20, 67, 89, 134, 167, 178, 268, 334, 335, 356, 445, 668, 670, 835, 890, 1340, 1670, 1780, 3340, 5963, 11189, 11926, 14863, 22378, 23852, 29726, 29815, 44756, 55945, 59452, 59630, 74315, 111890, 119260, 148630, 223780, 297260, 995821, 1991642, 3983284, 4979105, 9958210, 19916420]

約数ペア:

[(1, 19916420), (2, 9958210), (4, 4979105), (5, 3983284), (10, 1991642), (20, 995821), (67, 297260), (89, 223780), (134, 148630), (167, 119260), (178, 111890), (268, 74315), (334, 59630), (335, 59452), (356, 55945), (445, 44756), (668, 29815), (670, 29726), (835, 23852), (890, 22378), (1340, 14863), (1670, 11926), (1780, 11189), (3340, 5963)]