19781720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{53}}^1$

素因数の和:145

約数の個数: 128

約数和(自身を含む): 54743040

約数和(自身を除く): 34961320

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 31, 35, 40, 43, 53, 56, 62, 70, 86, 106, 124, 140, 155, 172, 212, 215, 217, 248, 265, 280, 301, 310, 344, 371, 424, 430, 434, 530, 602, 620, 742, 860, 868, 1060, 1085, 1204, 1240, 1333, 1484, 1505, 1643, 1720, 1736, 1855, 2120, 2170, 2279, 2408, 2666, 2968, 3010, 3286, 3710, 4340, 4558, 5332, 6020, 6572, 6665, 7420, 8215, 8680, 9116, 9331, 10664, 11395, 11501, 12040, 13144, 13330, 14840, 15953, 16430, 18232, 18662, 22790, 23002, 26660, 31906, 32860, 37324, 45580, 46004, 46655, 53320, 57505, 63812, 65720, 70649, 74648, 79765, 91160, 92008, 93310, 115010, 127624, 141298, 159530, 186620, 230020, 282596, 319060, 353245, 373240, 460040, 494543, 565192, 638120, 706490, 989086, 1412980, 1978172, 2472715, 2825960, 3956344, 4945430, 9890860, 19781720]

約数ペア:

[(1, 19781720), (2, 9890860), (4, 4945430), (5, 3956344), (7, 2825960), (8, 2472715), (10, 1978172), (14, 1412980), (20, 989086), (28, 706490), (31, 638120), (35, 565192), (40, 494543), (43, 460040), (53, 373240), (56, 353245), (62, 319060), (70, 282596), (86, 230020), (106, 186620), (124, 159530), (140, 141298), (155, 127624), (172, 115010), (212, 93310), (215, 92008), (217, 91160), (248, 79765), (265, 74648), (280, 70649), (301, 65720), (310, 63812), (344, 57505), (371, 53320), (424, 46655), (430, 46004), (434, 45580), (530, 37324), (602, 32860), (620, 31906), (742, 26660), (860, 23002), (868, 22790), (1060, 18662), (1085, 18232), (1204, 16430), (1240, 15953), (1333, 14840), (1484, 13330), (1505, 13144), (1643, 12040), (1720, 11501), (1736, 11395), (1855, 10664), (2120, 9331), (2170, 9116), (2279, 8680), (2408, 8215), (2666, 7420), (2968, 6665), (3010, 6572), (3286, 6020), (3710, 5332), (4340, 4558)]