18764920

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{409}}^1$

素因数の和:488

約数の個数: 64

約数和(自身を含む): 44870400

約数和(自身を除く): 26105480

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 37, 40, 62, 74, 124, 148, 155, 185, 248, 296, 310, 370, 409, 620, 740, 818, 1147, 1240, 1480, 1636, 2045, 2294, 3272, 4090, 4588, 5735, 8180, 9176, 11470, 12679, 15133, 16360, 22940, 25358, 30266, 45880, 50716, 60532, 63395, 75665, 101432, 121064, 126790, 151330, 253580, 302660, 469123, 507160, 605320, 938246, 1876492, 2345615, 3752984, 4691230, 9382460, 18764920]

約数ペア:

[(1, 18764920), (2, 9382460), (4, 4691230), (5, 3752984), (8, 2345615), (10, 1876492), (20, 938246), (31, 605320), (37, 507160), (40, 469123), (62, 302660), (74, 253580), (124, 151330), (148, 126790), (155, 121064), (185, 101432), (248, 75665), (296, 63395), (310, 60532), (370, 50716), (409, 45880), (620, 30266), (740, 25358), (818, 22940), (1147, 16360), (1240, 15133), (1480, 12679), (1636, 11470), (2045, 9176), (2294, 8180), (3272, 5735), (4090, 4588)]