21486825

素因数分解:

$3^2\times 5^2\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{89}}^1$

素因数の和:171

約数の個数: 72

約数和(自身を含む): 41347800

約数和(自身を除く): 19860975

約数列:

[1, 3, 5, 9, 15, 25, 29, 37, 45, 75, 87, 89, 111, 145, 185, 225, 261, 267, 333, 435, 445, 555, 725, 801, 925, 1073, 1305, 1335, 1665, 2175, 2225, 2581, 2775, 3219, 3293, 4005, 5365, 6525, 6675, 7743, 8325, 9657, 9879, 12905, 16095, 16465, 20025, 23229, 26825, 29637, 38715, 48285, 49395, 64525, 80475, 82325, 95497, 116145, 148185, 193575, 241425, 246975, 286491, 477485, 580725, 740925, 859473, 1432455, 2387425, 4297365, 7162275, 21486825]

約数ペア:

[(1, 21486825), (3, 7162275), (5, 4297365), (9, 2387425), (15, 1432455), (25, 859473), (29, 740925), (37, 580725), (45, 477485), (75, 286491), (87, 246975), (89, 241425), (111, 193575), (145, 148185), (185, 116145), (225, 95497), (261, 82325), (267, 80475), (333, 64525), (435, 49395), (445, 48285), (555, 38715), (725, 29637), (801, 26825), (925, 23229), (1073, 20025), (1305, 16465), (1335, 16095), (1665, 12905), (2175, 9879), (2225, 9657), (2581, 8325), (2775, 7743), (3219, 6675), (3293, 6525), (4005, 5365)]