21157965

素因数分解:

$3^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{523}}^1$

素因数の和:594

約数の個数: 48

約数和(自身を含む): 39237120

約数和(自身を除く): 18079155

約数列:

[1, 3, 5, 9, 15, 29, 31, 45, 87, 93, 145, 155, 261, 279, 435, 465, 523, 899, 1305, 1395, 1569, 2615, 2697, 4495, 4707, 7845, 8091, 13485, 15167, 16213, 23535, 40455, 45501, 48639, 75835, 81065, 136503, 145917, 227505, 243195, 470177, 682515, 729585, 1410531, 2350885, 4231593, 7052655, 21157965]

約数ペア:

[(1, 21157965), (3, 7052655), (5, 4231593), (9, 2350885), (15, 1410531), (29, 729585), (31, 682515), (45, 470177), (87, 243195), (93, 227505), (145, 145917), (155, 136503), (261, 81065), (279, 75835), (435, 48639), (465, 45501), (523, 40455), (899, 23535), (1305, 16213), (1395, 15167), (1569, 13485), (2615, 8091), (2697, 7845), (4495, 4707)]