21054540

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{26993}}^1$

素因数の和:27018

約数の個数: 48

約数和(自身を含む): 63489888

約数和(自身を除く): 42435348

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780, 26993, 53986, 80979, 107972, 134965, 161958, 269930, 323916, 350909, 404895, 539860, 701818, 809790, 1052727, 1403636, 1619580, 1754545, 2105454, 3509090, 4210908, 5263635, 7018180, 10527270, 21054540]

約数ペア:

[(1, 21054540), (2, 10527270), (3, 7018180), (4, 5263635), (5, 4210908), (6, 3509090), (10, 2105454), (12, 1754545), (13, 1619580), (15, 1403636), (20, 1052727), (26, 809790), (30, 701818), (39, 539860), (52, 404895), (60, 350909), (65, 323916), (78, 269930), (130, 161958), (156, 134965), (195, 107972), (260, 80979), (390, 53986), (780, 26993)]