21391930

素因数分解:

$2^1\times 5^1\times 7^2\times {\mathrm{149}}^1\times {\mathrm{293}}^1$

素因数の和:463

約数の個数: 48

約数和(自身を含む): 45246600

約数和(自身を除く): 23854670

約数列:

[1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 149, 245, 293, 298, 490, 586, 745, 1043, 1465, 1490, 2051, 2086, 2930, 4102, 5215, 7301, 10255, 10430, 14357, 14602, 20510, 28714, 36505, 43657, 71785, 73010, 87314, 143570, 218285, 305599, 436570, 611198, 1527995, 2139193, 3055990, 4278386, 10695965, 21391930]

約数ペア:

[(1, 21391930), (2, 10695965), (5, 4278386), (7, 3055990), (10, 2139193), (14, 1527995), (35, 611198), (49, 436570), (70, 305599), (98, 218285), (149, 143570), (245, 87314), (293, 73010), (298, 71785), (490, 43657), (586, 36505), (745, 28714), (1043, 20510), (1465, 14602), (1490, 14357), (2051, 10430), (2086, 10255), (2930, 7301), (4102, 5215)]