21655875

素因数分解:

$3^1\times 5^3\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1$

素因数の和:157

約数の個数: 64

約数和(自身を含む): 39536640

約数和(自身を除く): 17880765

約数列:

[1, 3, 5, 15, 17, 25, 43, 51, 75, 79, 85, 125, 129, 215, 237, 255, 375, 395, 425, 645, 731, 1075, 1185, 1275, 1343, 1975, 2125, 2193, 3225, 3397, 3655, 4029, 5375, 5925, 6375, 6715, 9875, 10191, 10965, 16125, 16985, 18275, 20145, 29625, 33575, 50955, 54825, 57749, 84925, 91375, 100725, 167875, 173247, 254775, 274125, 288745, 424625, 503625, 866235, 1273875, 1443725, 4331175, 7218625, 21655875]

約数ペア:

[(1, 21655875), (3, 7218625), (5, 4331175), (15, 1443725), (17, 1273875), (25, 866235), (43, 503625), (51, 424625), (75, 288745), (79, 274125), (85, 254775), (125, 173247), (129, 167875), (215, 100725), (237, 91375), (255, 84925), (375, 57749), (395, 54825), (425, 50955), (645, 33575), (731, 29625), (1075, 20145), (1185, 18275), (1275, 16985), (1343, 16125), (1975, 10965), (2125, 10191), (2193, 9875), (3225, 6715), (3397, 6375), (3655, 5925), (4029, 5375)]