20402980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{97}}^1\times {\mathrm{809}}^1$

素因数の和:928

約数の個数: 48

約数和(自身を含む): 46675440

約数和(自身を除く): 26272460

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 97, 130, 194, 260, 388, 485, 809, 970, 1261, 1618, 1940, 2522, 3236, 4045, 5044, 6305, 8090, 10517, 12610, 16180, 21034, 25220, 42068, 52585, 78473, 105170, 156946, 210340, 313892, 392365, 784730, 1020149, 1569460, 2040298, 4080596, 5100745, 10201490, 20402980]

約数ペア:

[(1, 20402980), (2, 10201490), (4, 5100745), (5, 4080596), (10, 2040298), (13, 1569460), (20, 1020149), (26, 784730), (52, 392365), (65, 313892), (97, 210340), (130, 156946), (194, 105170), (260, 78473), (388, 52585), (485, 42068), (809, 25220), (970, 21034), (1261, 16180), (1618, 12610), (1940, 10517), (2522, 8090), (3236, 6305), (4045, 5044)]