21807880

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{409}}^1$

素因数の和:494

約数の個数: 64

約数和(自身を含む): 51955200

約数和(自身を除く): 30147320

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 43, 62, 86, 124, 155, 172, 215, 248, 310, 344, 409, 430, 620, 818, 860, 1240, 1333, 1636, 1720, 2045, 2666, 3272, 4090, 5332, 6665, 8180, 10664, 12679, 13330, 16360, 17587, 25358, 26660, 35174, 50716, 53320, 63395, 70348, 87935, 101432, 126790, 140696, 175870, 253580, 351740, 507160, 545197, 703480, 1090394, 2180788, 2725985, 4361576, 5451970, 10903940, 21807880]

約数ペア:

[(1, 21807880), (2, 10903940), (4, 5451970), (5, 4361576), (8, 2725985), (10, 2180788), (20, 1090394), (31, 703480), (40, 545197), (43, 507160), (62, 351740), (86, 253580), (124, 175870), (155, 140696), (172, 126790), (215, 101432), (248, 87935), (310, 70348), (344, 63395), (409, 53320), (430, 50716), (620, 35174), (818, 26660), (860, 25358), (1240, 17587), (1333, 16360), (1636, 13330), (1720, 12679), (2045, 10664), (2666, 8180), (3272, 6665), (4090, 5332)]