20004740

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{137}}^1\times {\mathrm{149}}^1$

素因数の和:309

約数の個数: 72

約数和(自身を含む): 49555800

約数和(自身を除く): 29551060

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 137, 140, 149, 196, 245, 274, 298, 490, 548, 596, 685, 745, 959, 980, 1043, 1370, 1490, 1918, 2086, 2740, 2980, 3836, 4172, 4795, 5215, 6713, 7301, 9590, 10430, 13426, 14602, 19180, 20413, 20860, 26852, 29204, 33565, 36505, 40826, 67130, 73010, 81652, 102065, 134260, 142891, 146020, 204130, 285782, 408260, 571564, 714455, 1000237, 1428910, 2000474, 2857820, 4000948, 5001185, 10002370, 20004740]

約数ペア:

[(1, 20004740), (2, 10002370), (4, 5001185), (5, 4000948), (7, 2857820), (10, 2000474), (14, 1428910), (20, 1000237), (28, 714455), (35, 571564), (49, 408260), (70, 285782), (98, 204130), (137, 146020), (140, 142891), (149, 134260), (196, 102065), (245, 81652), (274, 73010), (298, 67130), (490, 40826), (548, 36505), (596, 33565), (685, 29204), (745, 26852), (959, 20860), (980, 20413), (1043, 19180), (1370, 14602), (1490, 13426), (1918, 10430), (2086, 9590), (2740, 7301), (2980, 6713), (3836, 5215), (4172, 4795)]