21132920

素因数分解:

$2^3\times 5^1\times {\mathrm{37}}^1\times {\mathrm{109}}^1\times {\mathrm{131}}^1$

素因数の和:288

約数の個数: 64

約数和(自身を含む): 49658400

約数和(自身を除く): 28525480

約数列:

[1, 2, 4, 5, 8, 10, 20, 37, 40, 74, 109, 131, 148, 185, 218, 262, 296, 370, 436, 524, 545, 655, 740, 872, 1048, 1090, 1310, 1480, 2180, 2620, 4033, 4360, 4847, 5240, 8066, 9694, 14279, 16132, 19388, 20165, 24235, 28558, 32264, 38776, 40330, 48470, 57116, 71395, 80660, 96940, 114232, 142790, 161320, 193880, 285580, 528323, 571160, 1056646, 2113292, 2641615, 4226584, 5283230, 10566460, 21132920]

約数ペア:

[(1, 21132920), (2, 10566460), (4, 5283230), (5, 4226584), (8, 2641615), (10, 2113292), (20, 1056646), (37, 571160), (40, 528323), (74, 285580), (109, 193880), (131, 161320), (148, 142790), (185, 114232), (218, 96940), (262, 80660), (296, 71395), (370, 57116), (436, 48470), (524, 40330), (545, 38776), (655, 32264), (740, 28558), (872, 24235), (1048, 20165), (1090, 19388), (1310, 16132), (1480, 14279), (2180, 9694), (2620, 8066), (4033, 5240), (4360, 4847)]