21997820

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{73}}^1$

素因数の和:175

約数の個数: 96

約数和(自身を含む): 53954880

約数和(自身を除く): 31957060

約数列:

[1, 2, 4, 5, 10, 13, 19, 20, 26, 38, 52, 61, 65, 73, 76, 95, 122, 130, 146, 190, 244, 247, 260, 292, 305, 365, 380, 494, 610, 730, 793, 949, 988, 1159, 1220, 1235, 1387, 1460, 1586, 1898, 2318, 2470, 2774, 3172, 3796, 3965, 4453, 4636, 4745, 4940, 5548, 5795, 6935, 7930, 8906, 9490, 11590, 13870, 15067, 15860, 17812, 18031, 18980, 22265, 23180, 27740, 30134, 36062, 44530, 57889, 60268, 72124, 75335, 84607, 89060, 90155, 115778, 150670, 169214, 180310, 231556, 289445, 301340, 338428, 360620, 423035, 578890, 846070, 1099891, 1157780, 1692140, 2199782, 4399564, 5499455, 10998910, 21997820]

約数ペア:

[(1, 21997820), (2, 10998910), (4, 5499455), (5, 4399564), (10, 2199782), (13, 1692140), (19, 1157780), (20, 1099891), (26, 846070), (38, 578890), (52, 423035), (61, 360620), (65, 338428), (73, 301340), (76, 289445), (95, 231556), (122, 180310), (130, 169214), (146, 150670), (190, 115778), (244, 90155), (247, 89060), (260, 84607), (292, 75335), (305, 72124), (365, 60268), (380, 57889), (494, 44530), (610, 36062), (730, 30134), (793, 27740), (949, 23180), (988, 22265), (1159, 18980), (1220, 18031), (1235, 17812), (1387, 15860), (1460, 15067), (1586, 13870), (1898, 11590), (2318, 9490), (2470, 8906), (2774, 7930), (3172, 6935), (3796, 5795), (3965, 5548), (4453, 4940), (4636, 4745)]