21471555

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{131}}^1\times {\mathrm{223}}^1$

素因数の和:376

約数の個数: 48

約数和(自身を含む): 40449024

約数和(自身を除く): 18977469

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 105, 131, 147, 223, 245, 393, 655, 669, 735, 917, 1115, 1561, 1965, 2751, 3345, 4585, 4683, 6419, 7805, 10927, 13755, 19257, 23415, 29213, 32095, 32781, 54635, 87639, 96285, 146065, 163905, 204491, 438195, 613473, 1022455, 1431437, 3067365, 4294311, 7157185, 21471555]

約数ペア:

[(1, 21471555), (3, 7157185), (5, 4294311), (7, 3067365), (15, 1431437), (21, 1022455), (35, 613473), (49, 438195), (105, 204491), (131, 163905), (147, 146065), (223, 96285), (245, 87639), (393, 54635), (655, 32781), (669, 32095), (735, 29213), (917, 23415), (1115, 19257), (1561, 13755), (1965, 10927), (2751, 7805), (3345, 6419), (4585, 4683)]